diff --git a/Library/.rubocop.yml b/Library/.rubocop.yml
index 48b7093d1..d515d46b3 100644
--- a/Library/.rubocop.yml
+++ b/Library/.rubocop.yml
@@ -93,8 +93,7 @@ Style/ConditionalAssignment:
 Style/Documentation:
  Enabled: false
 
-# we want to add this slowly and manually
-# TODO: add to more files
+# don't want this for formulae but re-enabled for Library/Homebrew
 Style/FrozenStringLiteralComment:
   Enabled: false
 
diff --git a/Library/Homebrew/.rubocop.yml b/Library/Homebrew/.rubocop.yml
index c91eaa0f2..416a664bb 100644
--- a/Library/Homebrew/.rubocop.yml
+++ b/Library/Homebrew/.rubocop.yml
@@ -117,6 +117,11 @@ Style/DocumentationMethod:
   Include:
     - 'Library/Homebrew/formula.rb'
 
+# don't want this for formulae but re-enabled for Library/Homebrew
+Style/FrozenStringLiteralComment:
+  Enabled: true
+  EnforcedStyle: always
+
 # so many of these in formulae but none in here
 Style/GuardClause:
   Enabled: true
diff --git a/Library/Homebrew/Gemfile b/Library/Homebrew/Gemfile
index 8fc84b9e5..975ad6383 100644
--- a/Library/Homebrew/Gemfile
+++ b/Library/Homebrew/Gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 # installed gems
diff --git a/Library/Homebrew/PATH.rb b/Library/Homebrew/PATH.rb
index 263f26484..4f46be178 100644
--- a/Library/Homebrew/PATH.rb
+++ b/Library/Homebrew/PATH.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PATH
   include Enumerable
   extend Forwardable
diff --git a/Library/Homebrew/brew.rb b/Library/Homebrew/brew.rb
index a84e32626..9c2b77c73 100644
--- a/Library/Homebrew/brew.rb
+++ b/Library/Homebrew/brew.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 raise "HOMEBREW_BREW_FILE was not exported! Please call bin/brew directly!" unless ENV["HOMEBREW_BREW_FILE"]
 
 std_trap = trap("INT") { exit! 130 } # no backtrace thanks
diff --git a/Library/Homebrew/brew.sh b/Library/Homebrew/brew.sh
index 761738c9e..ba6592eba 100644
--- a/Library/Homebrew/brew.sh
+++ b/Library/Homebrew/brew.sh
@@ -348,9 +348,6 @@ else
   RUBY_DISABLE_OPTIONS="--disable=gems,rubyopt"
 fi
 
-# Don't set this for anyone (yet)
-unset HOMEBREW_FROZEN_STRING_LITERAL
-
 if [[ -z "$HOMEBREW_RUBY_WARNINGS" ]]
 then
   export HOMEBREW_RUBY_WARNINGS="-W0"
@@ -502,5 +499,5 @@ else
 
   # Unshift command back into argument list (unless argument list was empty).
   [[ "$HOMEBREW_ARG_COUNT" -gt 0 ]] && set -- "$HOMEBREW_COMMAND" "$@"
-  { update-preinstall "$@"; exec "$HOMEBREW_RUBY_PATH" $HOMEBREW_FROZEN_STRING_LITERAL $HOMEBREW_RUBY_WARNINGS "$RUBY_DISABLE_OPTIONS" "$HOMEBREW_LIBRARY/Homebrew/brew.rb" "$@"; }
+  { update-preinstall "$@"; exec "$HOMEBREW_RUBY_PATH" $HOMEBREW_RUBY_WARNINGS "$RUBY_DISABLE_OPTIONS" "$HOMEBREW_LIBRARY/Homebrew/brew.rb" "$@"; }
 fi
diff --git a/Library/Homebrew/build.rb b/Library/Homebrew/build.rb
index ab99bf46e..7e6285220 100644
--- a/Library/Homebrew/build.rb
+++ b/Library/Homebrew/build.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This script is loaded by formula_installer as a separate instance.
 # Thrown exceptions are propagated back to the parent process over a pipe
 
diff --git a/Library/Homebrew/build_environment.rb b/Library/Homebrew/build_environment.rb
index d8ecdccbd..7a991f2be 100644
--- a/Library/Homebrew/build_environment.rb
+++ b/Library/Homebrew/build_environment.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class BuildEnvironment
   def initialize(*settings)
     @settings = Set.new(*settings)
diff --git a/Library/Homebrew/build_options.rb b/Library/Homebrew/build_options.rb
index bc7b278a6..fc81bb821 100644
--- a/Library/Homebrew/build_options.rb
+++ b/Library/Homebrew/build_options.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class BuildOptions
   # @private
   def initialize(args, options)
diff --git a/Library/Homebrew/cache_store.rb b/Library/Homebrew/cache_store.rb
index 9aeac80ee..842161ec1 100644
--- a/Library/Homebrew/cache_store.rb
+++ b/Library/Homebrew/cache_store.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "json"
 
 #
diff --git a/Library/Homebrew/cask/all.rb b/Library/Homebrew/cask/all.rb
index 6b8bf5f60..f84520567 100644
--- a/Library/Homebrew/cask/all.rb
+++ b/Library/Homebrew/cask/all.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "hardware"
 
 require "cask/artifact"
diff --git a/Library/Homebrew/cask/artifact.rb b/Library/Homebrew/cask/artifact.rb
index 1d89d6e9d..98ccf9d66 100644
--- a/Library/Homebrew/cask/artifact.rb
+++ b/Library/Homebrew/cask/artifact.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/app"
 require "cask/artifact/artifact" # generic 'artifact' stanza
 require "cask/artifact/binary"
diff --git a/Library/Homebrew/cask/artifact/abstract_artifact.rb b/Library/Homebrew/cask/artifact/abstract_artifact.rb
index c313fcdb4..d75748d99 100644
--- a/Library/Homebrew/cask/artifact/abstract_artifact.rb
+++ b/Library/Homebrew/cask/artifact/abstract_artifact.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   module Artifact
     class AbstractArtifact
diff --git a/Library/Homebrew/cask/artifact/abstract_flight_block.rb b/Library/Homebrew/cask/artifact/abstract_flight_block.rb
index dff490b77..3eb47fe82 100644
--- a/Library/Homebrew/cask/artifact/abstract_flight_block.rb
+++ b/Library/Homebrew/cask/artifact/abstract_flight_block.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/abstract_artifact"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/abstract_uninstall.rb b/Library/Homebrew/cask/artifact/abstract_uninstall.rb
index 9cca7f11b..82aa4fd46 100644
--- a/Library/Homebrew/cask/artifact/abstract_uninstall.rb
+++ b/Library/Homebrew/cask/artifact/abstract_uninstall.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "timeout"
 
 require "utils/user"
@@ -92,10 +94,10 @@ module Cask
               sleep 1
             end
             paths = [
-              "/Library/LaunchAgents/#{service}.plist",
-              "/Library/LaunchDaemons/#{service}.plist",
+              +"/Library/LaunchAgents/#{service}.plist",
+              +"/Library/LaunchDaemons/#{service}.plist",
             ]
-            paths.each { |elt| elt.prepend(ENV["HOME"]) } unless with_sudo
+            paths.each { |elt| elt.prepend(ENV["HOME"]).freeze } unless with_sudo
             paths = paths.map { |elt| Pathname(elt) }.select(&:exist?)
             paths.each do |path|
               command.run!("/bin/rm", args: ["-f", "--", path], sudo: with_sudo)
diff --git a/Library/Homebrew/cask/artifact/app.rb b/Library/Homebrew/cask/artifact/app.rb
index a1c92120e..99bf5fcbb 100644
--- a/Library/Homebrew/cask/artifact/app.rb
+++ b/Library/Homebrew/cask/artifact/app.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/moved"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/artifact.rb b/Library/Homebrew/cask/artifact/artifact.rb
index 39c751130..1252f40f0 100644
--- a/Library/Homebrew/cask/artifact/artifact.rb
+++ b/Library/Homebrew/cask/artifact/artifact.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/moved"
 
 require "extend/hash_validator"
diff --git a/Library/Homebrew/cask/artifact/audio_unit_plugin.rb b/Library/Homebrew/cask/artifact/audio_unit_plugin.rb
index 84c1a694a..b027d294d 100644
--- a/Library/Homebrew/cask/artifact/audio_unit_plugin.rb
+++ b/Library/Homebrew/cask/artifact/audio_unit_plugin.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/moved"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/binary.rb b/Library/Homebrew/cask/artifact/binary.rb
index a630e7c6f..39c525762 100644
--- a/Library/Homebrew/cask/artifact/binary.rb
+++ b/Library/Homebrew/cask/artifact/binary.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/symlinked"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/colorpicker.rb b/Library/Homebrew/cask/artifact/colorpicker.rb
index 28a9b7db0..627260c33 100644
--- a/Library/Homebrew/cask/artifact/colorpicker.rb
+++ b/Library/Homebrew/cask/artifact/colorpicker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/moved"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/dictionary.rb b/Library/Homebrew/cask/artifact/dictionary.rb
index 129fab095..fe2c2b65b 100644
--- a/Library/Homebrew/cask/artifact/dictionary.rb
+++ b/Library/Homebrew/cask/artifact/dictionary.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/moved"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/font.rb b/Library/Homebrew/cask/artifact/font.rb
index ebf158c22..3f9f38518 100644
--- a/Library/Homebrew/cask/artifact/font.rb
+++ b/Library/Homebrew/cask/artifact/font.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/moved"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/input_method.rb b/Library/Homebrew/cask/artifact/input_method.rb
index 3637e3ca2..802495184 100644
--- a/Library/Homebrew/cask/artifact/input_method.rb
+++ b/Library/Homebrew/cask/artifact/input_method.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/moved"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/installer.rb b/Library/Homebrew/cask/artifact/installer.rb
index 612b86c5f..e1be5f505 100644
--- a/Library/Homebrew/cask/artifact/installer.rb
+++ b/Library/Homebrew/cask/artifact/installer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/abstract_artifact"
 
 require "extend/hash_validator"
diff --git a/Library/Homebrew/cask/artifact/internet_plugin.rb b/Library/Homebrew/cask/artifact/internet_plugin.rb
index da7404789..21dd0b37f 100644
--- a/Library/Homebrew/cask/artifact/internet_plugin.rb
+++ b/Library/Homebrew/cask/artifact/internet_plugin.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/moved"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/moved.rb b/Library/Homebrew/cask/artifact/moved.rb
index 67b0ca2e5..077c957a5 100644
--- a/Library/Homebrew/cask/artifact/moved.rb
+++ b/Library/Homebrew/cask/artifact/moved.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/relocated"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/pkg.rb b/Library/Homebrew/cask/artifact/pkg.rb
index 505bbbb95..139a83571 100644
--- a/Library/Homebrew/cask/artifact/pkg.rb
+++ b/Library/Homebrew/cask/artifact/pkg.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "plist"
 
 require "utils/user"
diff --git a/Library/Homebrew/cask/artifact/postflight_block.rb b/Library/Homebrew/cask/artifact/postflight_block.rb
index 50c1e5d7f..43cb49f5b 100644
--- a/Library/Homebrew/cask/artifact/postflight_block.rb
+++ b/Library/Homebrew/cask/artifact/postflight_block.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/abstract_flight_block"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/preflight_block.rb b/Library/Homebrew/cask/artifact/preflight_block.rb
index 3984eab8a..341cdb1e0 100644
--- a/Library/Homebrew/cask/artifact/preflight_block.rb
+++ b/Library/Homebrew/cask/artifact/preflight_block.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/abstract_flight_block"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/prefpane.rb b/Library/Homebrew/cask/artifact/prefpane.rb
index 7221a1a80..393d6e5c4 100644
--- a/Library/Homebrew/cask/artifact/prefpane.rb
+++ b/Library/Homebrew/cask/artifact/prefpane.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/moved"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/qlplugin.rb b/Library/Homebrew/cask/artifact/qlplugin.rb
index 4317b5f3b..b9c5f8f06 100644
--- a/Library/Homebrew/cask/artifact/qlplugin.rb
+++ b/Library/Homebrew/cask/artifact/qlplugin.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/moved"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/relocated.rb b/Library/Homebrew/cask/artifact/relocated.rb
index 59fa34a0b..55d7efdc8 100644
--- a/Library/Homebrew/cask/artifact/relocated.rb
+++ b/Library/Homebrew/cask/artifact/relocated.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/abstract_artifact"
 
 require "extend/hash_validator"
@@ -50,7 +52,7 @@ module Cask
 
       private
 
-      ALT_NAME_ATTRIBUTE = "com.apple.metadata:kMDItemAlternateNames".freeze
+      ALT_NAME_ATTRIBUTE = "com.apple.metadata:kMDItemAlternateNames"
 
       # Try to make the asset searchable under the target name. Spotlight
       # respects this attribute for many filetypes, but ignores it for App
diff --git a/Library/Homebrew/cask/artifact/screen_saver.rb b/Library/Homebrew/cask/artifact/screen_saver.rb
index 2a7746e9b..ba3041625 100644
--- a/Library/Homebrew/cask/artifact/screen_saver.rb
+++ b/Library/Homebrew/cask/artifact/screen_saver.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/moved"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/service.rb b/Library/Homebrew/cask/artifact/service.rb
index 87c28928f..b42d22c43 100644
--- a/Library/Homebrew/cask/artifact/service.rb
+++ b/Library/Homebrew/cask/artifact/service.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/moved"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/stage_only.rb b/Library/Homebrew/cask/artifact/stage_only.rb
index add6ba3da..d0b2295c3 100644
--- a/Library/Homebrew/cask/artifact/stage_only.rb
+++ b/Library/Homebrew/cask/artifact/stage_only.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/abstract_artifact"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/suite.rb b/Library/Homebrew/cask/artifact/suite.rb
index 7a0289826..4d8332f70 100644
--- a/Library/Homebrew/cask/artifact/suite.rb
+++ b/Library/Homebrew/cask/artifact/suite.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/moved"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/symlinked.rb b/Library/Homebrew/cask/artifact/symlinked.rb
index dc6d434e2..8043f0a84 100644
--- a/Library/Homebrew/cask/artifact/symlinked.rb
+++ b/Library/Homebrew/cask/artifact/symlinked.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/relocated"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/uninstall.rb b/Library/Homebrew/cask/artifact/uninstall.rb
index 93b6ada85..cdd2da2b8 100644
--- a/Library/Homebrew/cask/artifact/uninstall.rb
+++ b/Library/Homebrew/cask/artifact/uninstall.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/abstract_uninstall"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/vst3_plugin.rb b/Library/Homebrew/cask/artifact/vst3_plugin.rb
index f067c014c..ea5dc05d0 100644
--- a/Library/Homebrew/cask/artifact/vst3_plugin.rb
+++ b/Library/Homebrew/cask/artifact/vst3_plugin.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/moved"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/vst_plugin.rb b/Library/Homebrew/cask/artifact/vst_plugin.rb
index 661e16de7..6796e286c 100644
--- a/Library/Homebrew/cask/artifact/vst_plugin.rb
+++ b/Library/Homebrew/cask/artifact/vst_plugin.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/moved"
 
 module Cask
diff --git a/Library/Homebrew/cask/artifact/zap.rb b/Library/Homebrew/cask/artifact/zap.rb
index 168797468..cd1ccc736 100644
--- a/Library/Homebrew/cask/artifact/zap.rb
+++ b/Library/Homebrew/cask/artifact/zap.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/artifact/abstract_uninstall"
 
 module Cask
diff --git a/Library/Homebrew/cask/audit.rb b/Library/Homebrew/cask/audit.rb
index 6e73ccf16..861a7064c 100644
--- a/Library/Homebrew/cask/audit.rb
+++ b/Library/Homebrew/cask/audit.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/checkable"
 require "cask/download"
 require "digest"
diff --git a/Library/Homebrew/cask/auditor.rb b/Library/Homebrew/cask/auditor.rb
index 8a5485739..c36aa5012 100644
--- a/Library/Homebrew/cask/auditor.rb
+++ b/Library/Homebrew/cask/auditor.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/download"
 
 module Cask
diff --git a/Library/Homebrew/cask/cache.rb b/Library/Homebrew/cask/cache.rb
index 525d8c2b6..228639862 100644
--- a/Library/Homebrew/cask/cache.rb
+++ b/Library/Homebrew/cask/cache.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   module Cache
     module_function
diff --git a/Library/Homebrew/cask/cask.rb b/Library/Homebrew/cask/cask.rb
index 46e7542bb..23d20dcc7 100644
--- a/Library/Homebrew/cask/cask.rb
+++ b/Library/Homebrew/cask/cask.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/cask_loader"
 require "cask/config"
 require "cask/dsl"
diff --git a/Library/Homebrew/cask/cask_dependencies.rb b/Library/Homebrew/cask/cask_dependencies.rb
index f40fc4fe9..8ef27001e 100644
--- a/Library/Homebrew/cask/cask_dependencies.rb
+++ b/Library/Homebrew/cask/cask_dependencies.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "delegate"
 
 require "cask/topological_hash"
diff --git a/Library/Homebrew/cask/cask_loader.rb b/Library/Homebrew/cask/cask_loader.rb
index 1416442b8..bd375b0de 100644
--- a/Library/Homebrew/cask/cask_loader.rb
+++ b/Library/Homebrew/cask/cask_loader.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/cask"
 require "uri"
 
diff --git a/Library/Homebrew/cask/caskroom.rb b/Library/Homebrew/cask/caskroom.rb
index 73a1b0ae8..542ea0bca 100644
--- a/Library/Homebrew/cask/caskroom.rb
+++ b/Library/Homebrew/cask/caskroom.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/user"
 
 module Cask
diff --git a/Library/Homebrew/cask/checkable.rb b/Library/Homebrew/cask/checkable.rb
index bac03f5fb..1e7a87464 100644
--- a/Library/Homebrew/cask/checkable.rb
+++ b/Library/Homebrew/cask/checkable.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   module Checkable
     def errors
diff --git a/Library/Homebrew/cask/cmd.rb b/Library/Homebrew/cask/cmd.rb
index 79b0077e2..eaa73213a 100644
--- a/Library/Homebrew/cask/cmd.rb
+++ b/Library/Homebrew/cask/cmd.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "optparse"
 require "shellwords"
 
diff --git a/Library/Homebrew/cask/cmd/abstract_command.rb b/Library/Homebrew/cask/cmd/abstract_command.rb
index 9b6510269..b08a3ea89 100644
--- a/Library/Homebrew/cask/cmd/abstract_command.rb
+++ b/Library/Homebrew/cask/cmd/abstract_command.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "options"
 require "search"
 
@@ -59,8 +61,7 @@ module Cask
         if matches.one?
           "Did you mean “#{matches.first}”?"
         elsif !matches.empty?
-          "Did you mean one of these?\n"
-            .concat(Formatter.columns(matches.take(20)))
+          "Did you mean one of these?\n#{Formatter.columns(matches.take(20))}"
         end
       end
     end
diff --git a/Library/Homebrew/cask/cmd/abstract_internal_command.rb b/Library/Homebrew/cask/cmd/abstract_internal_command.rb
index 52c47f5cb..c07fe8b5b 100644
--- a/Library/Homebrew/cask/cmd/abstract_internal_command.rb
+++ b/Library/Homebrew/cask/cmd/abstract_internal_command.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     class AbstractInternalCommand < AbstractCommand
diff --git a/Library/Homebrew/cask/cmd/audit.rb b/Library/Homebrew/cask/cmd/audit.rb
index a127bd4b1..5c9307aed 100644
--- a/Library/Homebrew/cask/cmd/audit.rb
+++ b/Library/Homebrew/cask/cmd/audit.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     class Audit < AbstractCommand
diff --git a/Library/Homebrew/cask/cmd/cat.rb b/Library/Homebrew/cask/cmd/cat.rb
index 558dadc21..627852257 100644
--- a/Library/Homebrew/cask/cmd/cat.rb
+++ b/Library/Homebrew/cask/cmd/cat.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     class Cat < AbstractCommand
diff --git a/Library/Homebrew/cask/cmd/create.rb b/Library/Homebrew/cask/cmd/create.rb
index 43da21044..68fb976da 100644
--- a/Library/Homebrew/cask/cmd/create.rb
+++ b/Library/Homebrew/cask/cmd/create.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     class Create < AbstractCommand
diff --git a/Library/Homebrew/cask/cmd/doctor.rb b/Library/Homebrew/cask/cmd/doctor.rb
index e1a0b583e..ddd033a2e 100644
--- a/Library/Homebrew/cask/cmd/doctor.rb
+++ b/Library/Homebrew/cask/cmd/doctor.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "system_config"
 require "cask/checkable"
 
diff --git a/Library/Homebrew/cask/cmd/edit.rb b/Library/Homebrew/cask/cmd/edit.rb
index 2687ce921..ff5f7569c 100644
--- a/Library/Homebrew/cask/cmd/edit.rb
+++ b/Library/Homebrew/cask/cmd/edit.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     class Edit < AbstractCommand
@@ -10,9 +12,9 @@ module Cask
       def run
         exec_editor cask_path
       rescue CaskUnavailableError => e
-        reason = e.reason.empty? ? "" : "#{e.reason} "
+        reason = e.reason.empty? ? +"" : +"#{e.reason} "
         reason.concat("Run #{Formatter.identifier("brew cask create #{e.token}")} to create a new Cask.")
-        raise e.class.new(e.token, reason)
+        raise e.class.new(e.token, reason.freeze)
       end
 
       def cask_path
diff --git a/Library/Homebrew/cask/cmd/fetch.rb b/Library/Homebrew/cask/cmd/fetch.rb
index 4b3d6d82c..cebf3d8d8 100644
--- a/Library/Homebrew/cask/cmd/fetch.rb
+++ b/Library/Homebrew/cask/cmd/fetch.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/download"
 
 module Cask
diff --git a/Library/Homebrew/cask/cmd/home.rb b/Library/Homebrew/cask/cmd/home.rb
index e9258a48a..16adc13a5 100644
--- a/Library/Homebrew/cask/cmd/home.rb
+++ b/Library/Homebrew/cask/cmd/home.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     class Home < AbstractCommand
diff --git a/Library/Homebrew/cask/cmd/info.rb b/Library/Homebrew/cask/cmd/info.rb
index 9899e6006..445388993 100644
--- a/Library/Homebrew/cask/cmd/info.rb
+++ b/Library/Homebrew/cask/cmd/info.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "json"
 require "cask/installer"
 
@@ -104,14 +106,14 @@ module Cask
       end
 
       def self.artifact_info(cask)
-        artifact_output = ohai_title("Artifacts")
+        artifact_output = ohai_title("Artifacts").dup
         cask.artifacts.each do |artifact|
           next unless artifact.respond_to?(:install_phase)
           next unless DSL::ORDINARY_ARTIFACT_CLASSES.include?(artifact.class)
 
           artifact_output << "\n" << artifact.to_s
         end
-        artifact_output
+        artifact_output.freeze
       end
     end
   end
diff --git a/Library/Homebrew/cask/cmd/install.rb b/Library/Homebrew/cask/cmd/install.rb
index fd9eda548..44a02ed00 100644
--- a/Library/Homebrew/cask/cmd/install.rb
+++ b/Library/Homebrew/cask/cmd/install.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     class Install < AbstractCommand
diff --git a/Library/Homebrew/cask/cmd/internal_help.rb b/Library/Homebrew/cask/cmd/internal_help.rb
index 9698a405f..2ddac93db 100644
--- a/Library/Homebrew/cask/cmd/internal_help.rb
+++ b/Library/Homebrew/cask/cmd/internal_help.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     class InternalHelp < AbstractInternalCommand
diff --git a/Library/Homebrew/cask/cmd/internal_stanza.rb b/Library/Homebrew/cask/cmd/internal_stanza.rb
index be830311a..9095614e1 100644
--- a/Library/Homebrew/cask/cmd/internal_stanza.rb
+++ b/Library/Homebrew/cask/cmd/internal_stanza.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     class InternalStanza < AbstractInternalCommand
diff --git a/Library/Homebrew/cask/cmd/list.rb b/Library/Homebrew/cask/cmd/list.rb
index 9d336366d..08e9604e1 100644
--- a/Library/Homebrew/cask/cmd/list.rb
+++ b/Library/Homebrew/cask/cmd/list.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     class List < AbstractCommand
diff --git a/Library/Homebrew/cask/cmd/options.rb b/Library/Homebrew/cask/cmd/options.rb
index 8de1a2863..9dca4e3d7 100644
--- a/Library/Homebrew/cask/cmd/options.rb
+++ b/Library/Homebrew/cask/cmd/options.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     module Options
diff --git a/Library/Homebrew/cask/cmd/outdated.rb b/Library/Homebrew/cask/cmd/outdated.rb
index 519758317..f11bd6dd3 100644
--- a/Library/Homebrew/cask/cmd/outdated.rb
+++ b/Library/Homebrew/cask/cmd/outdated.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     class Outdated < AbstractCommand
diff --git a/Library/Homebrew/cask/cmd/reinstall.rb b/Library/Homebrew/cask/cmd/reinstall.rb
index 87a964189..a8711bec8 100644
--- a/Library/Homebrew/cask/cmd/reinstall.rb
+++ b/Library/Homebrew/cask/cmd/reinstall.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     class Reinstall < Install
diff --git a/Library/Homebrew/cask/cmd/style.rb b/Library/Homebrew/cask/cmd/style.rb
index d2a4138ee..539aee117 100644
--- a/Library/Homebrew/cask/cmd/style.rb
+++ b/Library/Homebrew/cask/cmd/style.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     class Style < AbstractCommand
diff --git a/Library/Homebrew/cask/cmd/uninstall.rb b/Library/Homebrew/cask/cmd/uninstall.rb
index 9b9f13434..dfa8bbfb7 100644
--- a/Library/Homebrew/cask/cmd/uninstall.rb
+++ b/Library/Homebrew/cask/cmd/uninstall.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     class Uninstall < AbstractCommand
diff --git a/Library/Homebrew/cask/cmd/upgrade.rb b/Library/Homebrew/cask/cmd/upgrade.rb
index 709f64aa3..b248bbe14 100644
--- a/Library/Homebrew/cask/cmd/upgrade.rb
+++ b/Library/Homebrew/cask/cmd/upgrade.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/config"
 
 module Cask
diff --git a/Library/Homebrew/cask/cmd/zap.rb b/Library/Homebrew/cask/cmd/zap.rb
index 8436a1ff7..73a8b6858 100644
--- a/Library/Homebrew/cask/cmd/zap.rb
+++ b/Library/Homebrew/cask/cmd/zap.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Cmd
     class Zap < AbstractCommand
diff --git a/Library/Homebrew/cask/config.rb b/Library/Homebrew/cask/config.rb
index 404370e68..527e3f072 100644
--- a/Library/Homebrew/cask/config.rb
+++ b/Library/Homebrew/cask/config.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "json"
 
 require "extend/hash_validator"
diff --git a/Library/Homebrew/cask/download.rb b/Library/Homebrew/cask/download.rb
index 0a5b2c357..eb3a444bc 100644
--- a/Library/Homebrew/cask/download.rb
+++ b/Library/Homebrew/cask/download.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "fileutils"
 require "cask/cache"
 require "cask/quarantine"
diff --git a/Library/Homebrew/cask/dsl.rb b/Library/Homebrew/cask/dsl.rb
index 7db3d80df..eaceac002 100644
--- a/Library/Homebrew/cask/dsl.rb
+++ b/Library/Homebrew/cask/dsl.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "locale"
 require "lazy_object"
 
diff --git a/Library/Homebrew/cask/dsl/appcast.rb b/Library/Homebrew/cask/dsl/appcast.rb
index 98a041171..f2296ad94 100644
--- a/Library/Homebrew/cask/dsl/appcast.rb
+++ b/Library/Homebrew/cask/dsl/appcast.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class DSL
     class Appcast
diff --git a/Library/Homebrew/cask/dsl/base.rb b/Library/Homebrew/cask/dsl/base.rb
index d52675259..2a14a1c8c 100644
--- a/Library/Homebrew/cask/dsl/base.rb
+++ b/Library/Homebrew/cask/dsl/base.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class DSL
     class Base
diff --git a/Library/Homebrew/cask/dsl/caveats.rb b/Library/Homebrew/cask/dsl/caveats.rb
index e2e43349d..2ddd19b05 100644
--- a/Library/Homebrew/cask/dsl/caveats.rb
+++ b/Library/Homebrew/cask/dsl/caveats.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Caveats DSL. Each method should handle output, following the
 # convention of at least one trailing blank line so that the user
 # can distinguish separate caveats.
diff --git a/Library/Homebrew/cask/dsl/conflicts_with.rb b/Library/Homebrew/cask/dsl/conflicts_with.rb
index 2505743a6..abd947722 100644
--- a/Library/Homebrew/cask/dsl/conflicts_with.rb
+++ b/Library/Homebrew/cask/dsl/conflicts_with.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "extend/hash_validator"
 using HashValidator
 
diff --git a/Library/Homebrew/cask/dsl/container.rb b/Library/Homebrew/cask/dsl/container.rb
index 9c49e2da1..378e94ced 100644
--- a/Library/Homebrew/cask/dsl/container.rb
+++ b/Library/Homebrew/cask/dsl/container.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "unpack_strategy"
 
 module Cask
diff --git a/Library/Homebrew/cask/dsl/depends_on.rb b/Library/Homebrew/cask/dsl/depends_on.rb
index 13c8381d7..56a410727 100644
--- a/Library/Homebrew/cask/dsl/depends_on.rb
+++ b/Library/Homebrew/cask/dsl/depends_on.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubygems"
 
 module Cask
diff --git a/Library/Homebrew/cask/dsl/postflight.rb b/Library/Homebrew/cask/dsl/postflight.rb
index a2c0db3bc..9e0b1f55b 100644
--- a/Library/Homebrew/cask/dsl/postflight.rb
+++ b/Library/Homebrew/cask/dsl/postflight.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/staged"
 
 module Cask
diff --git a/Library/Homebrew/cask/dsl/preflight.rb b/Library/Homebrew/cask/dsl/preflight.rb
index 0eab22179..1cf1e03b5 100644
--- a/Library/Homebrew/cask/dsl/preflight.rb
+++ b/Library/Homebrew/cask/dsl/preflight.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class DSL
     class Preflight < Base
diff --git a/Library/Homebrew/cask/dsl/uninstall_postflight.rb b/Library/Homebrew/cask/dsl/uninstall_postflight.rb
index 458d96c73..db83749a2 100644
--- a/Library/Homebrew/cask/dsl/uninstall_postflight.rb
+++ b/Library/Homebrew/cask/dsl/uninstall_postflight.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class DSL
     class UninstallPostflight < Base
diff --git a/Library/Homebrew/cask/dsl/uninstall_preflight.rb b/Library/Homebrew/cask/dsl/uninstall_preflight.rb
index 38376f272..25d8f1d0d 100644
--- a/Library/Homebrew/cask/dsl/uninstall_preflight.rb
+++ b/Library/Homebrew/cask/dsl/uninstall_preflight.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/staged"
 
 module Cask
diff --git a/Library/Homebrew/cask/dsl/version.rb b/Library/Homebrew/cask/dsl/version.rb
index e93a886f8..29faf0c8a 100644
--- a/Library/Homebrew/cask/dsl/version.rb
+++ b/Library/Homebrew/cask/dsl/version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class DSL
     class Version < ::String
diff --git a/Library/Homebrew/cask/exceptions.rb b/Library/Homebrew/cask/exceptions.rb
index 8cbf70d10..401203f8a 100644
--- a/Library/Homebrew/cask/exceptions.rb
+++ b/Library/Homebrew/cask/exceptions.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class CaskError < RuntimeError; end
 
diff --git a/Library/Homebrew/cask/installer.rb b/Library/Homebrew/cask/installer.rb
index 98c1fc104..d59d7d3b4 100644
--- a/Library/Homebrew/cask/installer.rb
+++ b/Library/Homebrew/cask/installer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubygems"
 
 require "formula_installer"
@@ -136,9 +138,10 @@ module Cask
     end
 
     def summary
-      s = ""
+      s = +""
       s << "#{Emoji.install_badge}  " if Emoji.enabled?
       s << "#{@cask} was successfully #{upgrade? ? "upgraded" : "installed"}!"
+      s.freeze
     end
 
     def download
diff --git a/Library/Homebrew/cask/macos.rb b/Library/Homebrew/cask/macos.rb
index 967b895bc..84a8eb54e 100644
--- a/Library/Homebrew/cask/macos.rb
+++ b/Library/Homebrew/cask/macos.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "os/mac/version"
 
 module OS
diff --git a/Library/Homebrew/cask/metadata.rb b/Library/Homebrew/cask/metadata.rb
index 276554b35..9a47567e9 100644
--- a/Library/Homebrew/cask/metadata.rb
+++ b/Library/Homebrew/cask/metadata.rb
@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 module Cask
   module Metadata
-    METADATA_SUBDIR = ".metadata".freeze
+    METADATA_SUBDIR = ".metadata"
 
     def metadata_master_container_path
       @metadata_master_container_path ||= caskroom_path.join(METADATA_SUBDIR)
diff --git a/Library/Homebrew/cask/pkg.rb b/Library/Homebrew/cask/pkg.rb
index 070dd197d..42986319d 100644
--- a/Library/Homebrew/cask/pkg.rb
+++ b/Library/Homebrew/cask/pkg.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   class Pkg
     def self.all_matching(regexp, command)
diff --git a/Library/Homebrew/cask/quarantine.rb b/Library/Homebrew/cask/quarantine.rb
index 7cddb7b33..ee3cd70fa 100644
--- a/Library/Homebrew/cask/quarantine.rb
+++ b/Library/Homebrew/cask/quarantine.rb
@@ -1,9 +1,11 @@
+# frozen_string_literal: true
+
 require "development_tools"
 module Cask
   module Quarantine
     module_function
 
-    QUARANTINE_ATTRIBUTE = "com.apple.quarantine".freeze
+    QUARANTINE_ATTRIBUTE = "com.apple.quarantine"
 
     QUARANTINE_SCRIPT = (HOMEBREW_LIBRARY_PATH/"cask/utils/quarantine.swift").freeze
 
diff --git a/Library/Homebrew/cask/staged.rb b/Library/Homebrew/cask/staged.rb
index e2aacc351..b0216fc34 100644
--- a/Library/Homebrew/cask/staged.rb
+++ b/Library/Homebrew/cask/staged.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/user"
 
 module Cask
diff --git a/Library/Homebrew/cask/topological_hash.rb b/Library/Homebrew/cask/topological_hash.rb
index 8320bbb89..919dc161f 100644
--- a/Library/Homebrew/cask/topological_hash.rb
+++ b/Library/Homebrew/cask/topological_hash.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "tsort"
 
 # a basic topologically sortable hashmap
diff --git a/Library/Homebrew/cask/url.rb b/Library/Homebrew/cask/url.rb
index 678d79569..329a1bfe0 100644
--- a/Library/Homebrew/cask/url.rb
+++ b/Library/Homebrew/cask/url.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class URL
   ATTRIBUTES = [
     :using,
diff --git a/Library/Homebrew/cask/utils.rb b/Library/Homebrew/cask/utils.rb
index d95091a51..69bdd9652 100644
--- a/Library/Homebrew/cask/utils.rb
+++ b/Library/Homebrew/cask/utils.rb
@@ -1,9 +1,11 @@
+# frozen_string_literal: true
+
 require "utils/user"
 require "yaml"
 require "open3"
 require "stringio"
 
-BUG_REPORTS_URL = "https://github.com/Homebrew/homebrew-cask#reporting-bugs".freeze
+BUG_REPORTS_URL = "https://github.com/Homebrew/homebrew-cask#reporting-bugs"
 
 module Cask
   module Utils
diff --git a/Library/Homebrew/cask/verify.rb b/Library/Homebrew/cask/verify.rb
index 06bc03d8c..ca0c0ddee 100644
--- a/Library/Homebrew/cask/verify.rb
+++ b/Library/Homebrew/cask/verify.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   module Verify
     module_function
diff --git a/Library/Homebrew/caveats.rb b/Library/Homebrew/caveats.rb
index 6f9fcb9cc..620f40dc7 100644
--- a/Library/Homebrew/caveats.rb
+++ b/Library/Homebrew/caveats.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "language/python"
 
 class Caveats
@@ -40,7 +42,7 @@ class Caveats
         #{f.name} is keg-only, which means it was not symlinked into #{HOMEBREW_PREFIX},
         because #{f.keg_only_reason.to_s.chomp}.
       EOS
-    end
+    end.dup
 
     if f.bin.directory? || f.sbin.directory?
       s << <<~EOS
@@ -118,10 +120,10 @@ class Caveats
           #{root_dir}/share/zsh/site-functions
       EOS
     when :fish
-      fish_caveats = "fish #{installed.join(" and ")} have been installed to:"
+      fish_caveats = +"fish #{installed.join(" and ")} have been installed to:"
       fish_caveats << "\n  #{root_dir}/share/fish/vendor_completions.d" if completion_installed
       fish_caveats << "\n  #{root_dir}/share/fish/vendor_functions.d" if functions_installed
-      fish_caveats
+      fish_caveats.freeze
     end
   end
 
diff --git a/Library/Homebrew/checksum.rb b/Library/Homebrew/checksum.rb
index c1d0e7055..fe0960df4 100644
--- a/Library/Homebrew/checksum.rb
+++ b/Library/Homebrew/checksum.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Checksum
   extend Forwardable
 
diff --git a/Library/Homebrew/cleaner.rb b/Library/Homebrew/cleaner.rb
index 416de41fc..3f5e3aa37 100644
--- a/Library/Homebrew/cleaner.rb
+++ b/Library/Homebrew/cleaner.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Cleans a newly installed keg.
 # By default:
 #
diff --git a/Library/Homebrew/cleanup.rb b/Library/Homebrew/cleanup.rb
index cfce53568..7b569ca72 100644
--- a/Library/Homebrew/cleanup.rb
+++ b/Library/Homebrew/cleanup.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/bottles"
 require "utils/gems"
 require "formula"
diff --git a/Library/Homebrew/cli/args.rb b/Library/Homebrew/cli/args.rb
index 3f2ff6906..bcb3563cd 100644
--- a/Library/Homebrew/cli/args.rb
+++ b/Library/Homebrew/cli/args.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "ostruct"
 
 module Homebrew
diff --git a/Library/Homebrew/cli/parser.rb b/Library/Homebrew/cli/parser.rb
index bd3473558..8626201c8 100644
--- a/Library/Homebrew/cli/parser.rb
+++ b/Library/Homebrew/cli/parser.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/args"
 require "optparse"
 require "set"
diff --git a/Library/Homebrew/cmd/--cache.rb b/Library/Homebrew/cmd/--cache.rb
index a593af31d..c814e1a53 100644
--- a/Library/Homebrew/cmd/--cache.rb
+++ b/Library/Homebrew/cmd/--cache.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "fetch"
 require "cli/parser"
 
diff --git a/Library/Homebrew/cmd/--cellar.rb b/Library/Homebrew/cmd/--cellar.rb
index a9e7758fb..859d90b6d 100644
--- a/Library/Homebrew/cmd/--cellar.rb
+++ b/Library/Homebrew/cmd/--cellar.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/--env.rb b/Library/Homebrew/cmd/--env.rb
index 7a8c39bef..e696ca665 100644
--- a/Library/Homebrew/cmd/--env.rb
+++ b/Library/Homebrew/cmd/--env.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "extend/ENV"
 require "build_environment"
 require "utils/shell"
diff --git a/Library/Homebrew/cmd/--prefix.rb b/Library/Homebrew/cmd/--prefix.rb
index 86295cd2f..04135da0a 100644
--- a/Library/Homebrew/cmd/--prefix.rb
+++ b/Library/Homebrew/cmd/--prefix.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/--repository.rb b/Library/Homebrew/cmd/--repository.rb
index d283fbfed..2d3f6ba36 100644
--- a/Library/Homebrew/cmd/--repository.rb
+++ b/Library/Homebrew/cmd/--repository.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/--version.rb b/Library/Homebrew/cmd/--version.rb
index b5c4283be..c89ba493d 100644
--- a/Library/Homebrew/cmd/--version.rb
+++ b/Library/Homebrew/cmd/--version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/analytics.rb b/Library/Homebrew/cmd/analytics.rb
index 0b24527d9..ac49c188d 100644
--- a/Library/Homebrew/cmd/analytics.rb
+++ b/Library/Homebrew/cmd/analytics.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/cask.rb b/Library/Homebrew/cmd/cask.rb
index 667c25607..82f0ffcd0 100644
--- a/Library/Homebrew/cmd/cask.rb
+++ b/Library/Homebrew/cmd/cask.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/all"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/cat.rb b/Library/Homebrew/cmd/cat.rb
index 3214d3d2f..a8c360dcc 100644
--- a/Library/Homebrew/cmd/cat.rb
+++ b/Library/Homebrew/cmd/cat.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/cleanup.rb b/Library/Homebrew/cmd/cleanup.rb
index dc714f0b5..e1840843b 100644
--- a/Library/Homebrew/cmd/cleanup.rb
+++ b/Library/Homebrew/cmd/cleanup.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cleanup"
 require "cli/parser"
 
diff --git a/Library/Homebrew/cmd/command.rb b/Library/Homebrew/cmd/command.rb
index 9fad816fd..0968eeda2 100644
--- a/Library/Homebrew/cmd/command.rb
+++ b/Library/Homebrew/cmd/command.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "commands"
 require "cli/parser"
 
diff --git a/Library/Homebrew/cmd/commands.rb b/Library/Homebrew/cmd/commands.rb
index 8705db094..3bf14e1fc 100644
--- a/Library/Homebrew/cmd/commands.rb
+++ b/Library/Homebrew/cmd/commands.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/config.rb b/Library/Homebrew/cmd/config.rb
index 7f21c9c34..f1e8e0a36 100644
--- a/Library/Homebrew/cmd/config.rb
+++ b/Library/Homebrew/cmd/config.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "system_config"
 require "cli/parser"
 
diff --git a/Library/Homebrew/cmd/deps.rb b/Library/Homebrew/cmd/deps.rb
index ed4ed9391..8835c5995 100644
--- a/Library/Homebrew/cmd/deps.rb
+++ b/Library/Homebrew/cmd/deps.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "ostruct"
 require "cli/parser"
diff --git a/Library/Homebrew/cmd/desc.rb b/Library/Homebrew/cmd/desc.rb
index 27689bd47..b30a8cb27 100644
--- a/Library/Homebrew/cmd/desc.rb
+++ b/Library/Homebrew/cmd/desc.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "descriptions"
 require "search"
 require "description_cache_store"
diff --git a/Library/Homebrew/cmd/diy.rb b/Library/Homebrew/cmd/diy.rb
index cda37e600..48bcc9ccc 100644
--- a/Library/Homebrew/cmd/diy.rb
+++ b/Library/Homebrew/cmd/diy.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "cli/parser"
 
diff --git a/Library/Homebrew/cmd/doctor.rb b/Library/Homebrew/cmd/doctor.rb
index 6f0557125..709bbaf38 100644
--- a/Library/Homebrew/cmd/doctor.rb
+++ b/Library/Homebrew/cmd/doctor.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "diagnostic"
 require "cli/parser"
 
diff --git a/Library/Homebrew/cmd/fetch.rb b/Library/Homebrew/cmd/fetch.rb
index f98ad6d8a..66fb5c5eb 100644
--- a/Library/Homebrew/cmd/fetch.rb
+++ b/Library/Homebrew/cmd/fetch.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "fetch"
 require "cli/parser"
diff --git a/Library/Homebrew/cmd/gist-logs.rb b/Library/Homebrew/cmd/gist-logs.rb
index a6329cc0a..6986f6160 100644
--- a/Library/Homebrew/cmd/gist-logs.rb
+++ b/Library/Homebrew/cmd/gist-logs.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "install"
 require "system_config"
diff --git a/Library/Homebrew/cmd/help.rb b/Library/Homebrew/cmd/help.rb
index 84d28ab35..d75c424e1 100644
--- a/Library/Homebrew/cmd/help.rb
+++ b/Library/Homebrew/cmd/help.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "help"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/home.rb b/Library/Homebrew/cmd/home.rb
index a00176207..eb81019d1 100644
--- a/Library/Homebrew/cmd/home.rb
+++ b/Library/Homebrew/cmd/home.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/info.rb b/Library/Homebrew/cmd/info.rb
index 0007af6fd..7bac8db03 100644
--- a/Library/Homebrew/cmd/info.rb
+++ b/Library/Homebrew/cmd/info.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "missing_formula"
 require "caveats"
 require "cli/parser"
diff --git a/Library/Homebrew/cmd/install.rb b/Library/Homebrew/cmd/install.rb
index 9200344a5..f64c03ea2 100644
--- a/Library/Homebrew/cmd/install.rb
+++ b/Library/Homebrew/cmd/install.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "missing_formula"
 require "formula_installer"
 require "development_tools"
diff --git a/Library/Homebrew/cmd/leaves.rb b/Library/Homebrew/cmd/leaves.rb
index 4583ec181..f9bbfe214 100644
--- a/Library/Homebrew/cmd/leaves.rb
+++ b/Library/Homebrew/cmd/leaves.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "tab"
 require "cli/parser"
diff --git a/Library/Homebrew/cmd/link.rb b/Library/Homebrew/cmd/link.rb
index 2427f798d..fe280a381 100644
--- a/Library/Homebrew/cmd/link.rb
+++ b/Library/Homebrew/cmd/link.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "ostruct"
 require "caveats"
 require "cli/parser"
diff --git a/Library/Homebrew/cmd/list.rb b/Library/Homebrew/cmd/list.rb
index cc590b090..3b3b1ef3f 100644
--- a/Library/Homebrew/cmd/list.rb
+++ b/Library/Homebrew/cmd/list.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "metafiles"
 require "formula"
 require "cli/parser"
diff --git a/Library/Homebrew/cmd/log.rb b/Library/Homebrew/cmd/log.rb
index 6506fd929..000543faa 100644
--- a/Library/Homebrew/cmd/log.rb
+++ b/Library/Homebrew/cmd/log.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "cli/parser"
 
diff --git a/Library/Homebrew/cmd/migrate.rb b/Library/Homebrew/cmd/migrate.rb
index 4c863b203..25a94da2a 100644
--- a/Library/Homebrew/cmd/migrate.rb
+++ b/Library/Homebrew/cmd/migrate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "migrator"
 require "cli/parser"
 
diff --git a/Library/Homebrew/cmd/missing.rb b/Library/Homebrew/cmd/missing.rb
index 56d7a3880..b0d4fb7ac 100644
--- a/Library/Homebrew/cmd/missing.rb
+++ b/Library/Homebrew/cmd/missing.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "tab"
 require "diagnostic"
diff --git a/Library/Homebrew/cmd/options.rb b/Library/Homebrew/cmd/options.rb
index 340355cac..e30baddfb 100644
--- a/Library/Homebrew/cmd/options.rb
+++ b/Library/Homebrew/cmd/options.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "options"
 require "cli/parser"
diff --git a/Library/Homebrew/cmd/outdated.rb b/Library/Homebrew/cmd/outdated.rb
index b23361247..6e66764fa 100644
--- a/Library/Homebrew/cmd/outdated.rb
+++ b/Library/Homebrew/cmd/outdated.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "keg"
 require "cli/parser"
diff --git a/Library/Homebrew/cmd/pin.rb b/Library/Homebrew/cmd/pin.rb
index 148f9f395..33ae70e43 100644
--- a/Library/Homebrew/cmd/pin.rb
+++ b/Library/Homebrew/cmd/pin.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "cli/parser"
 
diff --git a/Library/Homebrew/cmd/postinstall.rb b/Library/Homebrew/cmd/postinstall.rb
index 8c6207760..4f11e8931 100644
--- a/Library/Homebrew/cmd/postinstall.rb
+++ b/Library/Homebrew/cmd/postinstall.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "sandbox"
 require "formula_installer"
 require "cli/parser"
diff --git a/Library/Homebrew/cmd/readall.rb b/Library/Homebrew/cmd/readall.rb
index 3303abe37..24dd837e5 100644
--- a/Library/Homebrew/cmd/readall.rb
+++ b/Library/Homebrew/cmd/readall.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "readall"
 require "cli/parser"
 
diff --git a/Library/Homebrew/cmd/reinstall.rb b/Library/Homebrew/cmd/reinstall.rb
index 3cab67073..818597150 100644
--- a/Library/Homebrew/cmd/reinstall.rb
+++ b/Library/Homebrew/cmd/reinstall.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula_installer"
 require "development_tools"
 require "messages"
diff --git a/Library/Homebrew/cmd/search.rb b/Library/Homebrew/cmd/search.rb
index 4007527f9..3efacc74a 100644
--- a/Library/Homebrew/cmd/search.rb
+++ b/Library/Homebrew/cmd/search.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "missing_formula"
 require "descriptions"
diff --git a/Library/Homebrew/cmd/sh.rb b/Library/Homebrew/cmd/sh.rb
index 42137f067..6d3fec814 100644
--- a/Library/Homebrew/cmd/sh.rb
+++ b/Library/Homebrew/cmd/sh.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "extend/ENV"
 require "formula"
 require "cli/parser"
diff --git a/Library/Homebrew/cmd/style.rb b/Library/Homebrew/cmd/style.rb
index 881b73bd5..b62ac97c7 100644
--- a/Library/Homebrew/cmd/style.rb
+++ b/Library/Homebrew/cmd/style.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "json"
 require "open3"
 require "style"
diff --git a/Library/Homebrew/cmd/switch.rb b/Library/Homebrew/cmd/switch.rb
index 99484f83e..56e005d1d 100644
--- a/Library/Homebrew/cmd/switch.rb
+++ b/Library/Homebrew/cmd/switch.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "keg"
 require "cli/parser"
diff --git a/Library/Homebrew/cmd/tap-info.rb b/Library/Homebrew/cmd/tap-info.rb
index 134b0bf7c..a5f0093b2 100644
--- a/Library/Homebrew/cmd/tap-info.rb
+++ b/Library/Homebrew/cmd/tap-info.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/tap-pin.rb b/Library/Homebrew/cmd/tap-pin.rb
index 3f0ddcb9a..114dd9e65 100644
--- a/Library/Homebrew/cmd/tap-pin.rb
+++ b/Library/Homebrew/cmd/tap-pin.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/tap-unpin.rb b/Library/Homebrew/cmd/tap-unpin.rb
index 64a320f22..1cab3cbf6 100644
--- a/Library/Homebrew/cmd/tap-unpin.rb
+++ b/Library/Homebrew/cmd/tap-unpin.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/tap.rb b/Library/Homebrew/cmd/tap.rb
index d3cce4549..6bb3d164c 100644
--- a/Library/Homebrew/cmd/tap.rb
+++ b/Library/Homebrew/cmd/tap.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/uninstall.rb b/Library/Homebrew/cmd/uninstall.rb
index aff746b81..e50c8f8ca 100644
--- a/Library/Homebrew/cmd/uninstall.rb
+++ b/Library/Homebrew/cmd/uninstall.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "keg"
 require "formula"
 require "diagnostic"
diff --git a/Library/Homebrew/cmd/unlink.rb b/Library/Homebrew/cmd/unlink.rb
index b63b060f5..f41e95e8c 100644
--- a/Library/Homebrew/cmd/unlink.rb
+++ b/Library/Homebrew/cmd/unlink.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "ostruct"
 require "cli/parser"
 
diff --git a/Library/Homebrew/cmd/unpack.rb b/Library/Homebrew/cmd/unpack.rb
index e12b354c6..f56ae42a6 100644
--- a/Library/Homebrew/cmd/unpack.rb
+++ b/Library/Homebrew/cmd/unpack.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "stringio"
 require "formula"
 require "cli/parser"
diff --git a/Library/Homebrew/cmd/unpin.rb b/Library/Homebrew/cmd/unpin.rb
index 0722418d1..2ffd94989 100644
--- a/Library/Homebrew/cmd/unpin.rb
+++ b/Library/Homebrew/cmd/unpin.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "cli/parser"
 
diff --git a/Library/Homebrew/cmd/untap.rb b/Library/Homebrew/cmd/untap.rb
index d86c80f37..333399984 100644
--- a/Library/Homebrew/cmd/untap.rb
+++ b/Library/Homebrew/cmd/untap.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/update-report.rb b/Library/Homebrew/cmd/update-report.rb
index d8da2b0d4..0f8e8f213 100644
--- a/Library/Homebrew/cmd/update-report.rb
+++ b/Library/Homebrew/cmd/update-report.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula_versions"
 require "migrator"
 require "formulary"
diff --git a/Library/Homebrew/cmd/upgrade.rb b/Library/Homebrew/cmd/upgrade.rb
index cd71173a8..c968c5b32 100644
--- a/Library/Homebrew/cmd/upgrade.rb
+++ b/Library/Homebrew/cmd/upgrade.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "install"
 require "reinstall"
 require "formula_installer"
diff --git a/Library/Homebrew/cmd/uses.rb b/Library/Homebrew/cmd/uses.rb
index f8fd73b24..d70f877a3 100644
--- a/Library/Homebrew/cmd/uses.rb
+++ b/Library/Homebrew/cmd/uses.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "cli/parser"
 
diff --git a/Library/Homebrew/commands.rb b/Library/Homebrew/commands.rb
index 9f25f2a2e..46db17891 100644
--- a/Library/Homebrew/commands.rb
+++ b/Library/Homebrew/commands.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Commands
   def self.path(cmd)
     [
diff --git a/Library/Homebrew/compilers.rb b/Library/Homebrew/compilers.rb
index a76f2ba1d..e2c608068 100644
--- a/Library/Homebrew/compilers.rb
+++ b/Library/Homebrew/compilers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # @private
 module CompilerConstants
   GNU_GCC_VERSIONS = %w[4.9 5 6 7 8].freeze
diff --git a/Library/Homebrew/config.rb b/Library/Homebrew/config.rb
index 7dec7452c..30d39094d 100644
--- a/Library/Homebrew/config.rb
+++ b/Library/Homebrew/config.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 raise "HOMEBREW_BREW_FILE was not exported! Please call bin/brew directly!" unless ENV["HOMEBREW_BREW_FILE"]
 
 # Path to `bin/brew` main executable in `HOMEBREW_PREFIX`
diff --git a/Library/Homebrew/cxxstdlib.rb b/Library/Homebrew/cxxstdlib.rb
index 82f4c7605..1b279c28b 100644
--- a/Library/Homebrew/cxxstdlib.rb
+++ b/Library/Homebrew/cxxstdlib.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "compilers"
 
 class CxxStdlib
diff --git a/Library/Homebrew/debrew.rb b/Library/Homebrew/debrew.rb
index de5c4686a..f3827b964 100644
--- a/Library/Homebrew/debrew.rb
+++ b/Library/Homebrew/debrew.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "mutex_m"
 require "debrew/irb"
 
diff --git a/Library/Homebrew/debrew/irb.rb b/Library/Homebrew/debrew/irb.rb
index eeb3758a9..7087bd859 100644
--- a/Library/Homebrew/debrew/irb.rb
+++ b/Library/Homebrew/debrew/irb.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "irb"
 
 module IRB
diff --git a/Library/Homebrew/dependable.rb b/Library/Homebrew/dependable.rb
index ce0f5fd4e..2b97e7db7 100644
--- a/Library/Homebrew/dependable.rb
+++ b/Library/Homebrew/dependable.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "options"
 
 module Dependable
diff --git a/Library/Homebrew/dependencies.rb b/Library/Homebrew/dependencies.rb
index 386890c80..dff99d540 100644
--- a/Library/Homebrew/dependencies.rb
+++ b/Library/Homebrew/dependencies.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "delegate"
 
 class Dependencies < DelegateClass(Array)
diff --git a/Library/Homebrew/dependency.rb b/Library/Homebrew/dependency.rb
index b5afba777..ec9acadab 100644
--- a/Library/Homebrew/dependency.rb
+++ b/Library/Homebrew/dependency.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "dependable"
 
 # A dependency on another Homebrew formula.
diff --git a/Library/Homebrew/dependency_collector.rb b/Library/Homebrew/dependency_collector.rb
index 8ad82f9ce..e7e9e9006 100644
--- a/Library/Homebrew/dependency_collector.rb
+++ b/Library/Homebrew/dependency_collector.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "dependency"
 require "dependencies"
 require "requirement"
diff --git a/Library/Homebrew/description_cache_store.rb b/Library/Homebrew/description_cache_store.rb
index 984cefd16..b507aed6b 100644
--- a/Library/Homebrew/description_cache_store.rb
+++ b/Library/Homebrew/description_cache_store.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "set"
 require "cache_store"
 require "searchable"
diff --git a/Library/Homebrew/descriptions.rb b/Library/Homebrew/descriptions.rb
index 137c79bf3..46b7f2ef3 100644
--- a/Library/Homebrew/descriptions.rb
+++ b/Library/Homebrew/descriptions.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "formula_versions"
 require "search"
diff --git a/Library/Homebrew/dev-cmd/audit.rb b/Library/Homebrew/dev-cmd/audit.rb
index e578558cc..690d04acf 100644
--- a/Library/Homebrew/dev-cmd/audit.rb
+++ b/Library/Homebrew/dev-cmd/audit.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "formula_versions"
 require "utils/curl"
diff --git a/Library/Homebrew/dev-cmd/bottle.rb b/Library/Homebrew/dev-cmd/bottle.rb
index 60d10efa4..7ff09281f 100644
--- a/Library/Homebrew/dev-cmd/bottle.rb
+++ b/Library/Homebrew/dev-cmd/bottle.rb
@@ -1,3 +1,7 @@
+# Uses ERB so can't use Frozen String Literals until >=Ruby 2.4:
+# https://bugs.ruby-lang.org/issues/12031
+# frozen_string_literal: false
+
 require "formula"
 require "utils/bottles"
 require "tab"
@@ -39,7 +43,7 @@ module Homebrew
 
   def bottle_args
     Homebrew::CLI::Parser.new do
-      usage_banner <<~EOS
+      usage_banner <<~EOS.freeze
         `bottle` [<options>] <formula>
 
         Generate a bottle (binary package) from a formula that was installed with
@@ -376,7 +380,7 @@ module Homebrew
           "#{key}: old: #{old_value}, new: #{value}"
         end
 
-        odie <<~EOS
+        odie <<~EOS.freeze
           --keep-old was passed but there are changes in:
           #{mismatches.join("\n")}
         EOS
@@ -487,7 +491,7 @@ module Homebrew
               end
 
               unless mismatches.empty?
-                odie <<~EOS
+                odie <<~EOS.freeze
                   --keep-old was passed but there are changes in:
                   #{mismatches.join("\n")}
                 EOS
diff --git a/Library/Homebrew/dev-cmd/bump-formula-pr.rb b/Library/Homebrew/dev-cmd/bump-formula-pr.rb
index f81211371..574a0c9a4 100644
--- a/Library/Homebrew/dev-cmd/bump-formula-pr.rb
+++ b/Library/Homebrew/dev-cmd/bump-formula-pr.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "cli/parser"
 
diff --git a/Library/Homebrew/dev-cmd/create.rb b/Library/Homebrew/dev-cmd/create.rb
index 308320459..96bdaf524 100644
--- a/Library/Homebrew/dev-cmd/create.rb
+++ b/Library/Homebrew/dev-cmd/create.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "formula_creator"
 require "missing_formula"
diff --git a/Library/Homebrew/dev-cmd/edit.rb b/Library/Homebrew/dev-cmd/edit.rb
index 1b1b6f341..b4ace42c5 100644
--- a/Library/Homebrew/dev-cmd/edit.rb
+++ b/Library/Homebrew/dev-cmd/edit.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "cli/parser"
 
diff --git a/Library/Homebrew/dev-cmd/extract.rb b/Library/Homebrew/dev-cmd/extract.rb
index 6b532f882..761d63af6 100644
--- a/Library/Homebrew/dev-cmd/extract.rb
+++ b/Library/Homebrew/dev-cmd/extract.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 require "utils/git"
 require "formulary"
diff --git a/Library/Homebrew/dev-cmd/formula.rb b/Library/Homebrew/dev-cmd/formula.rb
index 673588fa9..7b1ca2307 100644
--- a/Library/Homebrew/dev-cmd/formula.rb
+++ b/Library/Homebrew/dev-cmd/formula.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "cli/parser"
 
diff --git a/Library/Homebrew/dev-cmd/irb.rb b/Library/Homebrew/dev-cmd/irb.rb
index e0fa43c68..819373f5b 100644
--- a/Library/Homebrew/dev-cmd/irb.rb
+++ b/Library/Homebrew/dev-cmd/irb.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 class Symbol
diff --git a/Library/Homebrew/dev-cmd/linkage.rb b/Library/Homebrew/dev-cmd/linkage.rb
index 4da94cfdd..d864ec9c3 100644
--- a/Library/Homebrew/dev-cmd/linkage.rb
+++ b/Library/Homebrew/dev-cmd/linkage.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cache_store"
 require "linkage_checker"
 require "cli/parser"
diff --git a/Library/Homebrew/dev-cmd/man.rb b/Library/Homebrew/dev-cmd/man.rb
index 2efa0a0e9..5e07666f0 100644
--- a/Library/Homebrew/dev-cmd/man.rb
+++ b/Library/Homebrew/dev-cmd/man.rb
@@ -1,3 +1,7 @@
+# Uses ERB so can't use Frozen String Literals until >=Ruby 2.4:
+# https://bugs.ruby-lang.org/issues/12031
+# frozen_string_literal: false
+
 require "formula"
 require "erb"
 require "ostruct"
@@ -14,7 +18,7 @@ module Homebrew
 
   def man_args
     Homebrew::CLI::Parser.new do
-      usage_banner <<~EOS
+      usage_banner <<~EOS.freeze
         `man` [<options>]
 
         Generate Homebrew's manpages.
diff --git a/Library/Homebrew/dev-cmd/mirror.rb b/Library/Homebrew/dev-cmd/mirror.rb
index 8662756db..298e9e594 100644
--- a/Library/Homebrew/dev-cmd/mirror.rb
+++ b/Library/Homebrew/dev-cmd/mirror.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/dev-cmd/prof.rb b/Library/Homebrew/dev-cmd/prof.rb
index be85d0f98..e84cd11ae 100644
--- a/Library/Homebrew/dev-cmd/prof.rb
+++ b/Library/Homebrew/dev-cmd/prof.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/dev-cmd/pull.rb b/Library/Homebrew/dev-cmd/pull.rb
index 9a2fcd6c8..0fbfffeb1 100644
--- a/Library/Homebrew/dev-cmd/pull.rb
+++ b/Library/Homebrew/dev-cmd/pull.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "net/http"
 require "net/https"
 require "json"
diff --git a/Library/Homebrew/dev-cmd/release-notes.rb b/Library/Homebrew/dev-cmd/release-notes.rb
index 2b51ee960..fd65abc49 100644
--- a/Library/Homebrew/dev-cmd/release-notes.rb
+++ b/Library/Homebrew/dev-cmd/release-notes.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/dev-cmd/ruby.rb b/Library/Homebrew/dev-cmd/ruby.rb
index b7012a7d8..dcc20138e 100644
--- a/Library/Homebrew/dev-cmd/ruby.rb
+++ b/Library/Homebrew/dev-cmd/ruby.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/dev-cmd/tap-new.rb b/Library/Homebrew/dev-cmd/tap-new.rb
index 9408a8d0e..db5e742c1 100644
--- a/Library/Homebrew/dev-cmd/tap-new.rb
+++ b/Library/Homebrew/dev-cmd/tap-new.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "tap"
 require "cli/parser"
 
diff --git a/Library/Homebrew/dev-cmd/test.rb b/Library/Homebrew/dev-cmd/test.rb
index 5515c57f5..4c10ac558 100644
--- a/Library/Homebrew/dev-cmd/test.rb
+++ b/Library/Homebrew/dev-cmd/test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "extend/ENV"
 require "sandbox"
 require "timeout"
diff --git a/Library/Homebrew/dev-cmd/tests.rb b/Library/Homebrew/dev-cmd/tests.rb
index fb44ee660..34795359a 100644
--- a/Library/Homebrew/dev-cmd/tests.rb
+++ b/Library/Homebrew/dev-cmd/tests.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 require "fileutils"
 
diff --git a/Library/Homebrew/dev-cmd/update-test.rb b/Library/Homebrew/dev-cmd/update-test.rb
index 84832cd23..25c9e316a 100644
--- a/Library/Homebrew/dev-cmd/update-test.rb
+++ b/Library/Homebrew/dev-cmd/update-test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cli/parser"
 
 module Homebrew
diff --git a/Library/Homebrew/dev-cmd/vendor-gems.rb b/Library/Homebrew/dev-cmd/vendor-gems.rb
index 0188f9d7b..3c22d1c3a 100644
--- a/Library/Homebrew/dev-cmd/vendor-gems.rb
+++ b/Library/Homebrew/dev-cmd/vendor-gems.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "cli/parser"
 
diff --git a/Library/Homebrew/development_tools.rb b/Library/Homebrew/development_tools.rb
index b5d938ab5..aed19cc8d 100644
--- a/Library/Homebrew/development_tools.rb
+++ b/Library/Homebrew/development_tools.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # @private
 class DevelopmentTools
   class << self
diff --git a/Library/Homebrew/diagnostic.rb b/Library/Homebrew/diagnostic.rb
index 2560cfd7a..c713faf74 100644
--- a/Library/Homebrew/diagnostic.rb
+++ b/Library/Homebrew/diagnostic.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "keg"
 require "language/python"
 require "formula"
@@ -69,7 +71,8 @@ module Homebrew
       end
 
       def inject_file_list(list, string)
-        list.reduce(string) { |acc, elem| acc << "  #{elem}\n" }
+        list.reduce(string.dup) { |acc, elem| acc << "  #{elem}\n" }
+            .freeze
       end
       ############# END HELPERS
 
diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index 544c1e411..f2ef478d7 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "json"
 require "rexml/document"
 require "time"
diff --git a/Library/Homebrew/emoji.rb b/Library/Homebrew/emoji.rb
index 652d5b2eb..68e015630 100644
--- a/Library/Homebrew/emoji.rb
+++ b/Library/Homebrew/emoji.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Emoji
   class << self
     def install_badge
diff --git a/Library/Homebrew/exceptions.rb b/Library/Homebrew/exceptions.rb
index 4c4158295..5d6ca67cd 100644
--- a/Library/Homebrew/exceptions.rb
+++ b/Library/Homebrew/exceptions.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "shellwords"
 
 class UsageError < RuntimeError
@@ -529,7 +531,7 @@ class ErrorDuringExecution < RuntimeError
       status
     end
 
-    s = "Failure while executing; `#{cmd.shelljoin.gsub(/\\=/, "=")}` exited with #{exitstatus}."
+    s = +"Failure while executing; `#{cmd.shelljoin.gsub(/\\=/, "=")}` exited with #{exitstatus}."
 
     unless [*output].empty?
       format_output_line = lambda do |type_line|
@@ -546,7 +548,7 @@ class ErrorDuringExecution < RuntimeError
       s << "\n" unless s.end_with?("\n")
     end
 
-    super s
+    super s.freeze
   end
 
   def stderr
diff --git a/Library/Homebrew/extend/ARGV.rb b/Library/Homebrew/extend/ARGV.rb
index 57127524f..dfea80f2e 100644
--- a/Library/Homebrew/extend/ARGV.rb
+++ b/Library/Homebrew/extend/ARGV.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module HomebrewArgvExtension
   def named
     # TODO: use @instance variable to ||= cache when moving to CLI::Parser
diff --git a/Library/Homebrew/extend/ENV.rb b/Library/Homebrew/extend/ENV.rb
index e0eee1b75..4d8bae102 100644
--- a/Library/Homebrew/extend/ENV.rb
+++ b/Library/Homebrew/extend/ENV.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "hardware"
 require "extend/ENV/shared"
 require "extend/ENV/std"
diff --git a/Library/Homebrew/extend/ENV/shared.rb b/Library/Homebrew/extend/ENV/shared.rb
index 9198c19a6..067deee69 100644
--- a/Library/Homebrew/extend/ENV/shared.rb
+++ b/Library/Homebrew/extend/ENV/shared.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "compilers"
 require "development_tools"
 
diff --git a/Library/Homebrew/extend/ENV/std.rb b/Library/Homebrew/extend/ENV/std.rb
index eb079f19b..06f4e50d3 100644
--- a/Library/Homebrew/extend/ENV/std.rb
+++ b/Library/Homebrew/extend/ENV/std.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "hardware"
 require "extend/ENV/shared"
 
@@ -6,7 +8,7 @@ module Stdenv
   include SharedEnvExtension
 
   # @private
-  SAFE_CFLAGS_FLAGS = "-w -pipe".freeze
+  SAFE_CFLAGS_FLAGS = "-w -pipe"
 
   # @private
   def setup_build_environment(formula = nil)
diff --git a/Library/Homebrew/extend/ENV/super.rb b/Library/Homebrew/extend/ENV/super.rb
index 403144a3c..2aa440689 100644
--- a/Library/Homebrew/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/ENV/super.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "extend/ENV/shared"
 require "development_tools"
 
diff --git a/Library/Homebrew/extend/cachable.rb b/Library/Homebrew/extend/cachable.rb
index 69d86ccb7..754509648 100644
--- a/Library/Homebrew/extend/cachable.rb
+++ b/Library/Homebrew/extend/cachable.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cachable
   def cache
     @cache ||= {}
diff --git a/Library/Homebrew/extend/git_repository.rb b/Library/Homebrew/extend/git_repository.rb
index 8cd389ddf..caf69be7b 100644
--- a/Library/Homebrew/extend/git_repository.rb
+++ b/Library/Homebrew/extend/git_repository.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/git"
 require "utils/popen"
 
diff --git a/Library/Homebrew/extend/hash_validator.rb b/Library/Homebrew/extend/hash_validator.rb
index 1a00d3fa1..ff6d7aec5 100644
--- a/Library/Homebrew/extend/hash_validator.rb
+++ b/Library/Homebrew/extend/hash_validator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module HashValidator
   refine Hash do
     def assert_valid_keys!(*valid_keys)
diff --git a/Library/Homebrew/extend/io.rb b/Library/Homebrew/extend/io.rb
index 4ddfecde2..21080e1fe 100644
--- a/Library/Homebrew/extend/io.rb
+++ b/Library/Homebrew/extend/io.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class IO
   def readline_nonblock(sep = $INPUT_RECORD_SEPARATOR)
     line = +""
diff --git a/Library/Homebrew/extend/module.rb b/Library/Homebrew/extend/module.rb
index b31454373..5ba8ae7e0 100644
--- a/Library/Homebrew/extend/module.rb
+++ b/Library/Homebrew/extend/module.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Module
   def attr_rw(*attrs)
     file, line, = caller.first.split(":")
diff --git a/Library/Homebrew/extend/optparse.rb b/Library/Homebrew/extend/optparse.rb
index 801f7badd..d59dcbeca 100644
--- a/Library/Homebrew/extend/optparse.rb
+++ b/Library/Homebrew/extend/optparse.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "optparse"
 
 OptionParser.accept Pathname do |path|
diff --git a/Library/Homebrew/extend/os/analytics.rb b/Library/Homebrew/extend/os/analytics.rb
index 13b981169..749d80c66 100644
--- a/Library/Homebrew/extend/os/analytics.rb
+++ b/Library/Homebrew/extend/os/analytics.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "extend/os/mac/utils/analytics" if OS.mac?
diff --git a/Library/Homebrew/extend/os/bottles.rb b/Library/Homebrew/extend/os/bottles.rb
index 6ee9a2146..b9426c9d5 100644
--- a/Library/Homebrew/extend/os/bottles.rb
+++ b/Library/Homebrew/extend/os/bottles.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "extend/os/mac/utils/bottles" if OS.mac?
diff --git a/Library/Homebrew/extend/os/caveats.rb b/Library/Homebrew/extend/os/caveats.rb
index e67138087..6dddc2a8f 100644
--- a/Library/Homebrew/extend/os/caveats.rb
+++ b/Library/Homebrew/extend/os/caveats.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "extend/os/mac/caveats" if OS.mac?
diff --git a/Library/Homebrew/extend/os/cleaner.rb b/Library/Homebrew/extend/os/cleaner.rb
index 26226b93d..0fc9822e7 100644
--- a/Library/Homebrew/extend/os/cleaner.rb
+++ b/Library/Homebrew/extend/os/cleaner.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if OS.mac?
   require "extend/os/mac/cleaner"
 elsif OS.linux?
diff --git a/Library/Homebrew/extend/os/dependency_collector.rb b/Library/Homebrew/extend/os/dependency_collector.rb
index f3635e3da..b73abbdcf 100644
--- a/Library/Homebrew/extend/os/dependency_collector.rb
+++ b/Library/Homebrew/extend/os/dependency_collector.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if OS.mac?
   require "extend/os/mac/dependency_collector"
 elsif OS.linux?
diff --git a/Library/Homebrew/extend/os/development_tools.rb b/Library/Homebrew/extend/os/development_tools.rb
index 3280c85b0..61385fc5c 100644
--- a/Library/Homebrew/extend/os/development_tools.rb
+++ b/Library/Homebrew/extend/os/development_tools.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if OS.mac?
   require "extend/os/mac/development_tools"
 elsif OS.linux?
diff --git a/Library/Homebrew/extend/os/diagnostic.rb b/Library/Homebrew/extend/os/diagnostic.rb
index 34d09f961..d94fb033b 100644
--- a/Library/Homebrew/extend/os/diagnostic.rb
+++ b/Library/Homebrew/extend/os/diagnostic.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if OS.mac?
   require "extend/os/mac/diagnostic"
 elsif OS.linux?
diff --git a/Library/Homebrew/extend/os/extend/ENV/shared.rb b/Library/Homebrew/extend/os/extend/ENV/shared.rb
index 1a6b2294b..ee2c60f12 100644
--- a/Library/Homebrew/extend/os/extend/ENV/shared.rb
+++ b/Library/Homebrew/extend/os/extend/ENV/shared.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if OS.mac?
   require "extend/os/mac/extend/ENV/shared"
 elsif OS.linux?
diff --git a/Library/Homebrew/extend/os/extend/ENV/std.rb b/Library/Homebrew/extend/os/extend/ENV/std.rb
index 7d117c626..4fa49e135 100644
--- a/Library/Homebrew/extend/os/extend/ENV/std.rb
+++ b/Library/Homebrew/extend/os/extend/ENV/std.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if OS.mac?
   require "extend/os/mac/extend/ENV/std"
 elsif OS.linux?
diff --git a/Library/Homebrew/extend/os/extend/ENV/super.rb b/Library/Homebrew/extend/os/extend/ENV/super.rb
index 951f4cac8..e7d197638 100644
--- a/Library/Homebrew/extend/os/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/os/extend/ENV/super.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if OS.mac?
   require "extend/os/mac/extend/ENV/super"
 elsif OS.linux?
diff --git a/Library/Homebrew/extend/os/formula_cellar_checks.rb b/Library/Homebrew/extend/os/formula_cellar_checks.rb
index 30805adfb..85bf7f77b 100644
--- a/Library/Homebrew/extend/os/formula_cellar_checks.rb
+++ b/Library/Homebrew/extend/os/formula_cellar_checks.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if OS.mac?
   require "extend/os/mac/formula_cellar_checks"
 elsif OS.linux?
diff --git a/Library/Homebrew/extend/os/formula_support.rb b/Library/Homebrew/extend/os/formula_support.rb
index e1708c93d..b092c72bc 100644
--- a/Library/Homebrew/extend/os/formula_support.rb
+++ b/Library/Homebrew/extend/os/formula_support.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "extend/os/mac/formula_support" if OS.mac?
diff --git a/Library/Homebrew/extend/os/hardware.rb b/Library/Homebrew/extend/os/hardware.rb
index 728775cac..f23d41e4a 100644
--- a/Library/Homebrew/extend/os/hardware.rb
+++ b/Library/Homebrew/extend/os/hardware.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if OS.mac?
   require "extend/os/mac/hardware"
   require "extend/os/mac/hardware/cpu"
diff --git a/Library/Homebrew/extend/os/install.rb b/Library/Homebrew/extend/os/install.rb
index a98faed82..8e93626db 100644
--- a/Library/Homebrew/extend/os/install.rb
+++ b/Library/Homebrew/extend/os/install.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "extend/os/linux/install" if OS.linux?
diff --git a/Library/Homebrew/extend/os/keg.rb b/Library/Homebrew/extend/os/keg.rb
index 4164a9626..7b321b1b9 100644
--- a/Library/Homebrew/extend/os/keg.rb
+++ b/Library/Homebrew/extend/os/keg.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "extend/os/mac/keg" if OS.mac?
diff --git a/Library/Homebrew/extend/os/keg_relocate.rb b/Library/Homebrew/extend/os/keg_relocate.rb
index 6bfe18f28..2107c8388 100644
--- a/Library/Homebrew/extend/os/keg_relocate.rb
+++ b/Library/Homebrew/extend/os/keg_relocate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if OS.mac?
   require "extend/os/mac/keg_relocate"
 elsif OS.linux?
diff --git a/Library/Homebrew/extend/os/language/java.rb b/Library/Homebrew/extend/os/language/java.rb
index 0394f4199..03e20040e 100644
--- a/Library/Homebrew/extend/os/language/java.rb
+++ b/Library/Homebrew/extend/os/language/java.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "extend/os/mac/language/java" if OS.mac?
diff --git a/Library/Homebrew/extend/os/linkage_checker.rb b/Library/Homebrew/extend/os/linkage_checker.rb
index 9ded9646d..4fe4204f6 100644
--- a/Library/Homebrew/extend/os/linkage_checker.rb
+++ b/Library/Homebrew/extend/os/linkage_checker.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "extend/os/linux/linkage_checker" if OS.linux?
diff --git a/Library/Homebrew/extend/os/linux/cleaner.rb b/Library/Homebrew/extend/os/linux/cleaner.rb
index d82ef1164..21d646c0b 100644
--- a/Library/Homebrew/extend/os/linux/cleaner.rb
+++ b/Library/Homebrew/extend/os/linux/cleaner.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Cleaner
   private
 
diff --git a/Library/Homebrew/extend/os/linux/dependency_collector.rb b/Library/Homebrew/extend/os/linux/dependency_collector.rb
index 1949002cc..b965138c0 100644
--- a/Library/Homebrew/extend/os/linux/dependency_collector.rb
+++ b/Library/Homebrew/extend/os/linux/dependency_collector.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class DependencyCollector
   def java_dep_if_needed(tags)
     req = JavaRequirement.new(tags)
diff --git a/Library/Homebrew/extend/os/linux/development_tools.rb b/Library/Homebrew/extend/os/linux/development_tools.rb
index af0a12383..590c0e0d7 100644
--- a/Library/Homebrew/extend/os/linux/development_tools.rb
+++ b/Library/Homebrew/extend/os/linux/development_tools.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class DevelopmentTools
   class << self
     def locate(tool)
diff --git a/Library/Homebrew/extend/os/linux/diagnostic.rb b/Library/Homebrew/extend/os/linux/diagnostic.rb
index 7279e59fa..c1698eced 100644
--- a/Library/Homebrew/extend/os/linux/diagnostic.rb
+++ b/Library/Homebrew/extend/os/linux/diagnostic.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "tempfile"
 require "utils/shell"
 require "os/linux/diagnostic"
diff --git a/Library/Homebrew/extend/os/linux/extend/ENV/shared.rb b/Library/Homebrew/extend/os/linux/extend/ENV/shared.rb
index 4d938d08f..4b76a64af 100644
--- a/Library/Homebrew/extend/os/linux/extend/ENV/shared.rb
+++ b/Library/Homebrew/extend/os/linux/extend/ENV/shared.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module SharedEnvExtension
   # @private
   def effective_arch
diff --git a/Library/Homebrew/extend/os/linux/extend/ENV/std.rb b/Library/Homebrew/extend/os/linux/extend/ENV/std.rb
index a129530db..af3f462ee 100644
--- a/Library/Homebrew/extend/os/linux/extend/ENV/std.rb
+++ b/Library/Homebrew/extend/os/linux/extend/ENV/std.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Stdenv
   def setup_build_environment(formula = nil)
     generic_setup_build_environment(formula)
diff --git a/Library/Homebrew/extend/os/linux/extend/ENV/super.rb b/Library/Homebrew/extend/os/linux/extend/ENV/super.rb
index b8e1f1dd9..94eb819d6 100644
--- a/Library/Homebrew/extend/os/linux/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/os/linux/extend/ENV/super.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Superenv
   # @private
   def self.bin
diff --git a/Library/Homebrew/extend/os/linux/extend/pathname.rb b/Library/Homebrew/extend/os/linux/extend/pathname.rb
index 604351da7..7b4bd6371 100644
--- a/Library/Homebrew/extend/os/linux/extend/pathname.rb
+++ b/Library/Homebrew/extend/os/linux/extend/pathname.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "os/linux/elf"
 
 class Pathname
diff --git a/Library/Homebrew/extend/os/linux/formula_cellar_checks.rb b/Library/Homebrew/extend/os/linux/formula_cellar_checks.rb
index 0665f5678..00a14f98b 100644
--- a/Library/Homebrew/extend/os/linux/formula_cellar_checks.rb
+++ b/Library/Homebrew/extend/os/linux/formula_cellar_checks.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module FormulaCellarChecks
   def valid_library_extension?(filename)
     generic_valid_library_extension?(filename) || filename.basename.to_s.include?(".so.")
diff --git a/Library/Homebrew/extend/os/linux/hardware/cpu.rb b/Library/Homebrew/extend/os/linux/hardware/cpu.rb
index 75d983ff0..4de99e35f 100644
--- a/Library/Homebrew/extend/os/linux/hardware/cpu.rb
+++ b/Library/Homebrew/extend/os/linux/hardware/cpu.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Hardware
   class CPU
     class << self
diff --git a/Library/Homebrew/extend/os/linux/install.rb b/Library/Homebrew/extend/os/linux/install.rb
index 84b96ac06..7efbff87d 100644
--- a/Library/Homebrew/extend/os/linux/install.rb
+++ b/Library/Homebrew/extend/os/linux/install.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Homebrew
   module Install
     module_function
diff --git a/Library/Homebrew/extend/os/linux/keg_relocate.rb b/Library/Homebrew/extend/os/linux/keg_relocate.rb
index dd08361de..a3da66d27 100644
--- a/Library/Homebrew/extend/os/linux/keg_relocate.rb
+++ b/Library/Homebrew/extend/os/linux/keg_relocate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Keg
   def relocate_dynamic_linkage(relocation)
     # Patching the dynamic linker of glibc breaks it.
diff --git a/Library/Homebrew/extend/os/linux/linkage_checker.rb b/Library/Homebrew/extend/os/linux/linkage_checker.rb
index a1a6fa7f4..95fd37ac7 100644
--- a/Library/Homebrew/extend/os/linux/linkage_checker.rb
+++ b/Library/Homebrew/extend/os/linux/linkage_checker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class LinkageChecker
   # Libraries provided by glibc and gcc.
   SYSTEM_LIBRARY_WHITELIST = %w[
diff --git a/Library/Homebrew/extend/os/linux/requirements/java_requirement.rb b/Library/Homebrew/extend/os/linux/requirements/java_requirement.rb
index 23a68743d..1b1b6347c 100644
--- a/Library/Homebrew/extend/os/linux/requirements/java_requirement.rb
+++ b/Library/Homebrew/extend/os/linux/requirements/java_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "language/java"
 
 class JavaRequirement < Requirement
diff --git a/Library/Homebrew/extend/os/linux/requirements/osxfuse_requirement.rb b/Library/Homebrew/extend/os/linux/requirements/osxfuse_requirement.rb
index b4cb9fc62..2c2d79f45 100644
--- a/Library/Homebrew/extend/os/linux/requirements/osxfuse_requirement.rb
+++ b/Library/Homebrew/extend/os/linux/requirements/osxfuse_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirement"
 
 class OsxfuseRequirement < Requirement
diff --git a/Library/Homebrew/extend/os/linux/software_spec.rb b/Library/Homebrew/extend/os/linux/software_spec.rb
index 7e62ef9d8..12ed0de45 100644
--- a/Library/Homebrew/extend/os/linux/software_spec.rb
+++ b/Library/Homebrew/extend/os/linux/software_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class BottleSpecification
   def skip_relocation?
     false
diff --git a/Library/Homebrew/extend/os/linux/system_config.rb b/Library/Homebrew/extend/os/linux/system_config.rb
index 53c42fcf3..bae9ad3e4 100644
--- a/Library/Homebrew/extend/os/linux/system_config.rb
+++ b/Library/Homebrew/extend/os/linux/system_config.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "os/linux/glibc"
 
diff --git a/Library/Homebrew/extend/os/linux/tap.rb b/Library/Homebrew/extend/os/linux/tap.rb
index 4242ef099..854a3d9eb 100644
--- a/Library/Homebrew/extend/os/linux/tap.rb
+++ b/Library/Homebrew/extend/os/linux/tap.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CoreTap < Tap
   # @private
   def initialize
diff --git a/Library/Homebrew/extend/os/mac/caveats.rb b/Library/Homebrew/extend/os/mac/caveats.rb
index 7ddfb5fb4..05df496cb 100644
--- a/Library/Homebrew/extend/os/mac/caveats.rb
+++ b/Library/Homebrew/extend/os/mac/caveats.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Caveats
   undef plist_caveats
 
diff --git a/Library/Homebrew/extend/os/mac/cleaner.rb b/Library/Homebrew/extend/os/mac/cleaner.rb
index 69d82814d..35b6e374c 100644
--- a/Library/Homebrew/extend/os/mac/cleaner.rb
+++ b/Library/Homebrew/extend/os/mac/cleaner.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Cleaner
   private
 
diff --git a/Library/Homebrew/extend/os/mac/dependency_collector.rb b/Library/Homebrew/extend/os/mac/dependency_collector.rb
index 014fecdb5..11c58bbe7 100644
--- a/Library/Homebrew/extend/os/mac/dependency_collector.rb
+++ b/Library/Homebrew/extend/os/mac/dependency_collector.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class DependencyCollector
   undef git_dep_if_needed, subversion_dep_if_needed, cvs_dep_if_needed,
         xz_dep_if_needed, unzip_dep_if_needed, bzip2_dep_if_needed
diff --git a/Library/Homebrew/extend/os/mac/development_tools.rb b/Library/Homebrew/extend/os/mac/development_tools.rb
index 0d175c0ec..e1b1d0e87 100644
--- a/Library/Homebrew/extend/os/mac/development_tools.rb
+++ b/Library/Homebrew/extend/os/mac/development_tools.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "os/mac/xcode"
 
 # @private
diff --git a/Library/Homebrew/extend/os/mac/diagnostic.rb b/Library/Homebrew/extend/os/mac/diagnostic.rb
index 3847d64ad..ae16cf562 100644
--- a/Library/Homebrew/extend/os/mac/diagnostic.rb
+++ b/Library/Homebrew/extend/os/mac/diagnostic.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Homebrew
   module Diagnostic
     class Checks
diff --git a/Library/Homebrew/extend/os/mac/extend/ENV/shared.rb b/Library/Homebrew/extend/os/mac/extend/ENV/shared.rb
index 67a3944c3..476d30f75 100644
--- a/Library/Homebrew/extend/os/mac/extend/ENV/shared.rb
+++ b/Library/Homebrew/extend/os/mac/extend/ENV/shared.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module SharedEnvExtension
   def no_weak_imports_support?
     return false unless compiler == :clang
diff --git a/Library/Homebrew/extend/os/mac/extend/ENV/std.rb b/Library/Homebrew/extend/os/mac/extend/ENV/std.rb
index a44a614a6..049fa6adc 100644
--- a/Library/Homebrew/extend/os/mac/extend/ENV/std.rb
+++ b/Library/Homebrew/extend/os/mac/extend/ENV/std.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Stdenv
   # @private
 
diff --git a/Library/Homebrew/extend/os/mac/extend/ENV/super.rb b/Library/Homebrew/extend/os/mac/extend/ENV/super.rb
index 6cc29ba1e..b5485e33a 100644
--- a/Library/Homebrew/extend/os/mac/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/os/mac/extend/ENV/super.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Superenv
   class << self
     undef bin
diff --git a/Library/Homebrew/extend/os/mac/extend/pathname.rb b/Library/Homebrew/extend/os/mac/extend/pathname.rb
index 4ced5a094..9289aa73b 100644
--- a/Library/Homebrew/extend/os/mac/extend/pathname.rb
+++ b/Library/Homebrew/extend/os/mac/extend/pathname.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "os/mac/mach"
 
 class Pathname
diff --git a/Library/Homebrew/extend/os/mac/formula_cellar_checks.rb b/Library/Homebrew/extend/os/mac/formula_cellar_checks.rb
index 97b02c91d..9f0805404 100644
--- a/Library/Homebrew/extend/os/mac/formula_cellar_checks.rb
+++ b/Library/Homebrew/extend/os/mac/formula_cellar_checks.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cache_store"
 require "linkage_checker"
 
diff --git a/Library/Homebrew/extend/os/mac/formula_support.rb b/Library/Homebrew/extend/os/mac/formula_support.rb
index 39309663d..95f316be8 100644
--- a/Library/Homebrew/extend/os/mac/formula_support.rb
+++ b/Library/Homebrew/extend/os/mac/formula_support.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class KegOnlyReason
   def valid?
     true
diff --git a/Library/Homebrew/extend/os/mac/hardware.rb b/Library/Homebrew/extend/os/mac/hardware.rb
index 25e9d0c58..b41439350 100644
--- a/Library/Homebrew/extend/os/mac/hardware.rb
+++ b/Library/Homebrew/extend/os/mac/hardware.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Hardware
   def self.oldest_cpu(version = MacOS.version)
     if version >= :mojave
diff --git a/Library/Homebrew/extend/os/mac/hardware/cpu.rb b/Library/Homebrew/extend/os/mac/hardware/cpu.rb
index c8e3c9f39..75a56877e 100644
--- a/Library/Homebrew/extend/os/mac/hardware/cpu.rb
+++ b/Library/Homebrew/extend/os/mac/hardware/cpu.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Hardware
   class CPU
     class << self
diff --git a/Library/Homebrew/extend/os/mac/keg.rb b/Library/Homebrew/extend/os/mac/keg.rb
index a0dc175ca..c0b1e3fcc 100644
--- a/Library/Homebrew/extend/os/mac/keg.rb
+++ b/Library/Homebrew/extend/os/mac/keg.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Keg
   GENERIC_KEG_LINK_DIRECTORIES = (remove_const :KEG_LINK_DIRECTORIES).freeze
   KEG_LINK_DIRECTORIES = (GENERIC_KEG_LINK_DIRECTORIES + ["Frameworks"]).freeze
diff --git a/Library/Homebrew/extend/os/mac/keg_relocate.rb b/Library/Homebrew/extend/os/mac/keg_relocate.rb
index 8fed56b88..170b828a7 100644
--- a/Library/Homebrew/extend/os/mac/keg_relocate.rb
+++ b/Library/Homebrew/extend/os/mac/keg_relocate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Keg
   class << self
     undef file_linked_libraries
diff --git a/Library/Homebrew/extend/os/mac/language/java.rb b/Library/Homebrew/extend/os/mac/language/java.rb
index ef5615353..d750bf632 100644
--- a/Library/Homebrew/extend/os/mac/language/java.rb
+++ b/Library/Homebrew/extend/os/mac/language/java.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Language
   module Java
     def self.java_home_cmd(version = nil)
diff --git a/Library/Homebrew/extend/os/mac/missing_formula.rb b/Library/Homebrew/extend/os/mac/missing_formula.rb
index cf54137ad..5e4879b72 100644
--- a/Library/Homebrew/extend/os/mac/missing_formula.rb
+++ b/Library/Homebrew/extend/os/mac/missing_formula.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Homebrew
   module MissingFormula
     class << self
diff --git a/Library/Homebrew/extend/os/mac/requirements/java_requirement.rb b/Library/Homebrew/extend/os/mac/requirements/java_requirement.rb
index 59b208d78..f8130f758 100644
--- a/Library/Homebrew/extend/os/mac/requirements/java_requirement.rb
+++ b/Library/Homebrew/extend/os/mac/requirements/java_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class JavaRequirement < Requirement
   env do
     env_java_common
diff --git a/Library/Homebrew/extend/os/mac/requirements/osxfuse_requirement.rb b/Library/Homebrew/extend/os/mac/requirements/osxfuse_requirement.rb
index f6ca8cfc2..bcdfabdf7 100644
--- a/Library/Homebrew/extend/os/mac/requirements/osxfuse_requirement.rb
+++ b/Library/Homebrew/extend/os/mac/requirements/osxfuse_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirement"
 
 class OsxfuseRequirement < Requirement
diff --git a/Library/Homebrew/extend/os/mac/requirements/x11_requirement.rb b/Library/Homebrew/extend/os/mac/requirements/x11_requirement.rb
index f4a5da695..5c0f5cb9c 100644
--- a/Library/Homebrew/extend/os/mac/requirements/x11_requirement.rb
+++ b/Library/Homebrew/extend/os/mac/requirements/x11_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirement"
 
 class X11Requirement < Requirement
diff --git a/Library/Homebrew/extend/os/mac/search.rb b/Library/Homebrew/extend/os/mac/search.rb
index d26cf1727..82cf08b5c 100644
--- a/Library/Homebrew/extend/os/mac/search.rb
+++ b/Library/Homebrew/extend/os/mac/search.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/cask"
 require "cask/cask_loader"
 
diff --git a/Library/Homebrew/extend/os/mac/system_config.rb b/Library/Homebrew/extend/os/mac/system_config.rb
index ec017bdc2..6d92ee2d6 100644
--- a/Library/Homebrew/extend/os/mac/system_config.rb
+++ b/Library/Homebrew/extend/os/mac/system_config.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class SystemConfig
   class << self
     undef describe_java, describe_homebrew_ruby
diff --git a/Library/Homebrew/extend/os/mac/unpack_strategy/zip.rb b/Library/Homebrew/extend/os/mac/unpack_strategy/zip.rb
index 6f0dc90a3..4aaf225f1 100644
--- a/Library/Homebrew/extend/os/mac/unpack_strategy/zip.rb
+++ b/Library/Homebrew/extend/os/mac/unpack_strategy/zip.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Zip
     prepend Module.new {
diff --git a/Library/Homebrew/extend/os/mac/utils/analytics.rb b/Library/Homebrew/extend/os/mac/utils/analytics.rb
index f59ba37fe..3e624df8a 100644
--- a/Library/Homebrew/extend/os/mac/utils/analytics.rb
+++ b/Library/Homebrew/extend/os/mac/utils/analytics.rb
@@ -1,8 +1,10 @@
+# frozen_string_literal: true
+
 module Utils
   module Analytics
     class << self
       def custom_prefix_label
-        "non-/usr/local".freeze
+        "non-/usr/local"
       end
     end
   end
diff --git a/Library/Homebrew/extend/os/mac/utils/bottles.rb b/Library/Homebrew/extend/os/mac/utils/bottles.rb
index 954ca0b36..09bb7027b 100644
--- a/Library/Homebrew/extend/os/mac/utils/bottles.rb
+++ b/Library/Homebrew/extend/os/mac/utils/bottles.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Utils
   class Bottles
     class << self
diff --git a/Library/Homebrew/extend/os/missing_formula.rb b/Library/Homebrew/extend/os/missing_formula.rb
index c58992576..b77e64274 100644
--- a/Library/Homebrew/extend/os/missing_formula.rb
+++ b/Library/Homebrew/extend/os/missing_formula.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "extend/os/mac/missing_formula" if OS.mac?
diff --git a/Library/Homebrew/extend/os/pathname.rb b/Library/Homebrew/extend/os/pathname.rb
index 5e6edeb30..58e109e3f 100644
--- a/Library/Homebrew/extend/os/pathname.rb
+++ b/Library/Homebrew/extend/os/pathname.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if OS.mac?
   require "extend/os/mac/extend/pathname"
 elsif OS.linux?
diff --git a/Library/Homebrew/extend/os/requirements/java_requirement.rb b/Library/Homebrew/extend/os/requirements/java_requirement.rb
index 673d53079..85c36f1ae 100644
--- a/Library/Homebrew/extend/os/requirements/java_requirement.rb
+++ b/Library/Homebrew/extend/os/requirements/java_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if OS.mac?
   require "extend/os/mac/requirements/java_requirement"
 elsif OS.linux?
diff --git a/Library/Homebrew/extend/os/requirements/osxfuse_requirement.rb b/Library/Homebrew/extend/os/requirements/osxfuse_requirement.rb
index ab491aa1e..eab9176f3 100644
--- a/Library/Homebrew/extend/os/requirements/osxfuse_requirement.rb
+++ b/Library/Homebrew/extend/os/requirements/osxfuse_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if OS.mac?
   require "extend/os/mac/requirements/osxfuse_requirement"
 elsif OS.linux?
diff --git a/Library/Homebrew/extend/os/requirements/x11_requirement.rb b/Library/Homebrew/extend/os/requirements/x11_requirement.rb
index 664b6c7c0..5389f38a1 100644
--- a/Library/Homebrew/extend/os/requirements/x11_requirement.rb
+++ b/Library/Homebrew/extend/os/requirements/x11_requirement.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "extend/os/mac/requirements/x11_requirement" if OS.mac?
diff --git a/Library/Homebrew/extend/os/search.rb b/Library/Homebrew/extend/os/search.rb
index 69c6b0254..c6909a0fa 100644
--- a/Library/Homebrew/extend/os/search.rb
+++ b/Library/Homebrew/extend/os/search.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "extend/os/mac/search" if OS.mac?
diff --git a/Library/Homebrew/extend/os/software_spec.rb b/Library/Homebrew/extend/os/software_spec.rb
index a3421738f..aae7c1299 100644
--- a/Library/Homebrew/extend/os/software_spec.rb
+++ b/Library/Homebrew/extend/os/software_spec.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "extend/os/linux/software_spec" if OS.linux?
diff --git a/Library/Homebrew/extend/os/system_config.rb b/Library/Homebrew/extend/os/system_config.rb
index b80eec5e8..9c06e9a02 100644
--- a/Library/Homebrew/extend/os/system_config.rb
+++ b/Library/Homebrew/extend/os/system_config.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if OS.mac?
   require "extend/os/mac/system_config"
 elsif OS.linux?
diff --git a/Library/Homebrew/extend/os/tap.rb b/Library/Homebrew/extend/os/tap.rb
index 93c67d484..82e0a09f6 100644
--- a/Library/Homebrew/extend/os/tap.rb
+++ b/Library/Homebrew/extend/os/tap.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "extend/os/linux/tap" if OS.linux?
diff --git a/Library/Homebrew/extend/pathname.rb b/Library/Homebrew/extend/pathname.rb
index 77c3ce651..1ad0ff96a 100644
--- a/Library/Homebrew/extend/pathname.rb
+++ b/Library/Homebrew/extend/pathname.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "resource"
 require "metafiles"
 
diff --git a/Library/Homebrew/extend/predicable.rb b/Library/Homebrew/extend/predicable.rb
index d02fbb89b..dba7f17b5 100644
--- a/Library/Homebrew/extend/predicable.rb
+++ b/Library/Homebrew/extend/predicable.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Predicable
   def attr_predicate(*attrs)
     attrs.each do |attr|
diff --git a/Library/Homebrew/extend/string.rb b/Library/Homebrew/extend/string.rb
index 71f08c453..1d8619bb9 100644
--- a/Library/Homebrew/extend/string.rb
+++ b/Library/Homebrew/extend/string.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Contains backports from newer versions of Ruby
 require "backports/2.4.0/string/match"
 require "backports/2.5.0/string/delete_prefix"
diff --git a/Library/Homebrew/fetch.rb b/Library/Homebrew/fetch.rb
index 32f9e3f7c..4d9a13719 100644
--- a/Library/Homebrew/fetch.rb
+++ b/Library/Homebrew/fetch.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Homebrew
   module Fetch
     module_function
diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 5fd2553b5..79aa5f98f 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cache_store"
 require "formula_support"
 require "lock_file"
diff --git a/Library/Homebrew/formula_assertions.rb b/Library/Homebrew/formula_assertions.rb
index 2ef69d6d7..b1f9a2aab 100644
--- a/Library/Homebrew/formula_assertions.rb
+++ b/Library/Homebrew/formula_assertions.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Homebrew
   module Assertions
     require "rubygems"
diff --git a/Library/Homebrew/formula_cellar_checks.rb b/Library/Homebrew/formula_cellar_checks.rb
index c8080ec94..dfd7c3cc9 100644
--- a/Library/Homebrew/formula_cellar_checks.rb
+++ b/Library/Homebrew/formula_cellar_checks.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/shell"
 
 module FormulaCellarChecks
diff --git a/Library/Homebrew/formula_creator.rb b/Library/Homebrew/formula_creator.rb
index c9de19fb1..b7ee699a1 100644
--- a/Library/Homebrew/formula_creator.rb
+++ b/Library/Homebrew/formula_creator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "digest"
 require "erb"
 
diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index afedd08de..09fd6822b 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cxxstdlib"
 require "formula"
 require "keg"
@@ -664,7 +666,7 @@ class FormulaInstaller
   end
 
   def summary
-    s = ""
+    s = +""
     s << "#{Emoji.install_badge}  " if Emoji.enabled?
     s << "#{formula.prefix.resolved_path}: #{formula.prefix.abv}"
     s << ", built in #{pretty_duration build_time}" if build_time
diff --git a/Library/Homebrew/formula_pin.rb b/Library/Homebrew/formula_pin.rb
index c31280800..f9c54097f 100644
--- a/Library/Homebrew/formula_pin.rb
+++ b/Library/Homebrew/formula_pin.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "keg"
 
 class FormulaPin
diff --git a/Library/Homebrew/formula_support.rb b/Library/Homebrew/formula_support.rb
index 05347a10d..008c023b2 100644
--- a/Library/Homebrew/formula_support.rb
+++ b/Library/Homebrew/formula_support.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Used to track formulae that cannot be installed at the same time.
 FormulaConflict = Struct.new(:name, :reason)
 
diff --git a/Library/Homebrew/formula_versions.rb b/Library/Homebrew/formula_versions.rb
index c4248fbdf..ae1c67063 100644
--- a/Library/Homebrew/formula_versions.rb
+++ b/Library/Homebrew/formula_versions.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 
 class FormulaVersions
diff --git a/Library/Homebrew/formulary.rb b/Library/Homebrew/formulary.rb
index 9722eeafd..e884fe744 100644
--- a/Library/Homebrew/formulary.rb
+++ b/Library/Homebrew/formulary.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "digest/md5"
 require "extend/cachable"
 
diff --git a/Library/Homebrew/global.rb b/Library/Homebrew/global.rb
index 9f976f604..515617907 100644
--- a/Library/Homebrew/global.rb
+++ b/Library/Homebrew/global.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "English"
 require "json"
 require "json/add/exception"
@@ -33,7 +35,7 @@ ARGV.extend(HomebrewArgvExtension)
 
 HOMEBREW_PRODUCT = ENV["HOMEBREW_PRODUCT"]
 HOMEBREW_VERSION = ENV["HOMEBREW_VERSION"]
-HOMEBREW_WWW = "https://brew.sh".freeze
+HOMEBREW_WWW = "https://brew.sh"
 
 require "rbconfig"
 
@@ -42,10 +44,10 @@ RUBY_BIN = RUBY_PATH.dirname.freeze
 
 HOMEBREW_USER_AGENT_CURL = ENV["HOMEBREW_USER_AGENT_CURL"]
 HOMEBREW_USER_AGENT_RUBY =
-  "#{ENV["HOMEBREW_USER_AGENT"]} ruby/#{RUBY_VERSION}-p#{RUBY_PATCHLEVEL}".freeze
+  "#{ENV["HOMEBREW_USER_AGENT"]} ruby/#{RUBY_VERSION}-p#{RUBY_PATCHLEVEL}"
 HOMEBREW_USER_AGENT_FAKE_SAFARI =
   "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/602.4.8 " \
-  "(KHTML, like Gecko) Version/10.0.3 Safari/602.4.8".freeze
+  "(KHTML, like Gecko) Version/10.0.3 Safari/602.4.8"
 
 HOMEBREW_BOTTLE_DEFAULT_DOMAIN = ENV["HOMEBREW_BOTTLE_DEFAULT_DOMAIN"]
 HOMEBREW_BOTTLE_DOMAIN = ENV["HOMEBREW_BOTTLE_DOMAIN"]
@@ -57,9 +59,9 @@ require "os/global"
 module Homebrew
   extend FileUtils
 
-  DEFAULT_PREFIX ||= "/usr/local".freeze
-  DEFAULT_CELLAR = "#{DEFAULT_PREFIX}/Cellar".freeze
-  DEFAULT_REPOSITORY = "#{DEFAULT_PREFIX}/Homebrew".freeze
+  DEFAULT_PREFIX ||= "/usr/local"
+  DEFAULT_CELLAR = "#{DEFAULT_PREFIX}/Cellar"
+  DEFAULT_REPOSITORY = "#{DEFAULT_PREFIX}/Homebrew"
 
   class << self
     attr_writer :failed, :raise_deprecation_exceptions, :auditing, :args
diff --git a/Library/Homebrew/hardware.rb b/Library/Homebrew/hardware.rb
index cda94a491..37fd2c49c 100644
--- a/Library/Homebrew/hardware.rb
+++ b/Library/Homebrew/hardware.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Hardware
   class CPU
     INTEL_32BIT_ARCHS = [:i386].freeze
diff --git a/Library/Homebrew/help.rb b/Library/Homebrew/help.rb
index 6593b1baa..c99e6dae7 100644
--- a/Library/Homebrew/help.rb
+++ b/Library/Homebrew/help.rb
@@ -1,4 +1,6 @@
-HOMEBREW_HELP = <<~EOS.freeze
+# frozen_string_literal: true
+
+HOMEBREW_HELP = <<~EOS
   Example usage:
     brew search [TEXT|/REGEX/]
     brew info [FORMULA...]
diff --git a/Library/Homebrew/install.rb b/Library/Homebrew/install.rb
index 256993e3d..215845e36 100644
--- a/Library/Homebrew/install.rb
+++ b/Library/Homebrew/install.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "diagnostic"
 require "fileutils"
 require "hardware"
diff --git a/Library/Homebrew/install_renamed.rb b/Library/Homebrew/install_renamed.rb
index dc5d4cda8..9fa6f37fa 100644
--- a/Library/Homebrew/install_renamed.rb
+++ b/Library/Homebrew/install_renamed.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module InstallRenamed
   def install_p(_, new_basename)
     super do |src, dst|
diff --git a/Library/Homebrew/keg.rb b/Library/Homebrew/keg.rb
index 39125daa0..a1f480e1f 100644
--- a/Library/Homebrew/keg.rb
+++ b/Library/Homebrew/keg.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "keg_relocate"
 require "language/python"
 require "lock_file"
diff --git a/Library/Homebrew/keg_relocate.rb b/Library/Homebrew/keg_relocate.rb
index 9936ecbe2..b8028ceab 100644
--- a/Library/Homebrew/keg_relocate.rb
+++ b/Library/Homebrew/keg_relocate.rb
@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 class Keg
-  PREFIX_PLACEHOLDER = "@@HOMEBREW_PREFIX@@".freeze
-  CELLAR_PLACEHOLDER = "@@HOMEBREW_CELLAR@@".freeze
-  REPOSITORY_PLACEHOLDER = "@@HOMEBREW_REPOSITORY@@".freeze
+  PREFIX_PLACEHOLDER = "@@HOMEBREW_PREFIX@@"
+  CELLAR_PLACEHOLDER = "@@HOMEBREW_CELLAR@@"
+  REPOSITORY_PLACEHOLDER = "@@HOMEBREW_REPOSITORY@@"
 
   Relocation = Struct.new(:old_prefix, :old_cellar, :old_repository,
                           :new_prefix, :new_cellar, :new_repository) do
diff --git a/Library/Homebrew/language/go.rb b/Library/Homebrew/language/go.rb
index 90922ddb7..7dbbf5bf8 100644
--- a/Library/Homebrew/language/go.rb
+++ b/Library/Homebrew/language/go.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "resource"
 
 module Language
diff --git a/Library/Homebrew/language/haskell.rb b/Library/Homebrew/language/haskell.rb
index bf68441fa..e4b11e307 100644
--- a/Library/Homebrew/language/haskell.rb
+++ b/Library/Homebrew/language/haskell.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Language
   module Haskell
     module Cabal
diff --git a/Library/Homebrew/language/java.rb b/Library/Homebrew/language/java.rb
index 01ff28d9e..5311b1f58 100644
--- a/Library/Homebrew/language/java.rb
+++ b/Library/Homebrew/language/java.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Language
   module Java
     def self.java_home_cmd(_ = nil)
diff --git a/Library/Homebrew/language/node.rb b/Library/Homebrew/language/node.rb
index 28d9ee4b8..4ae81f0bc 100644
--- a/Library/Homebrew/language/node.rb
+++ b/Library/Homebrew/language/node.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Language
   module Node
     def self.npm_cache_config
diff --git a/Library/Homebrew/language/python.rb b/Library/Homebrew/language/python.rb
index f026e32a6..ce811330d 100644
--- a/Library/Homebrew/language/python.rb
+++ b/Library/Homebrew/language/python.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "language/python_virtualenv_constants"
 
 module Language
diff --git a/Library/Homebrew/language/python_virtualenv_constants.rb b/Library/Homebrew/language/python_virtualenv_constants.rb
index f39dd4ff2..67af7da6d 100644
--- a/Library/Homebrew/language/python_virtualenv_constants.rb
+++ b/Library/Homebrew/language/python_virtualenv_constants.rb
@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 PYTHON_VIRTUALENV_URL =
   "https://files.pythonhosted.org/packages/37/db" \
   "/89d6b043b22052109da35416abc3c397655e4bd3cff031446ba02b9654fa" \
-  "/virtualenv-16.4.3.tar.gz".freeze
+  "/virtualenv-16.4.3.tar.gz"
 PYTHON_VIRTUALENV_SHA256 =
-  "984d7e607b0a5d1329425dd8845bd971b957424b5ba664729fab51ab8c11bc39".freeze
+  "984d7e607b0a5d1329425dd8845bd971b957424b5ba664729fab51ab8c11bc39"
diff --git a/Library/Homebrew/lazy_object.rb b/Library/Homebrew/lazy_object.rb
index 520ae643d..d54f15ed7 100644
--- a/Library/Homebrew/lazy_object.rb
+++ b/Library/Homebrew/lazy_object.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class LazyObject < Delegator
   def initialize(&callable)
     super(callable)
diff --git a/Library/Homebrew/linkage_cache_store.rb b/Library/Homebrew/linkage_cache_store.rb
index 408ad0f22..6ab77998e 100644
--- a/Library/Homebrew/linkage_cache_store.rb
+++ b/Library/Homebrew/linkage_cache_store.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "set"
 require "cache_store"
 
diff --git a/Library/Homebrew/linkage_checker.rb b/Library/Homebrew/linkage_checker.rb
index 9e1a34fe6..27a6c0a38 100644
--- a/Library/Homebrew/linkage_checker.rb
+++ b/Library/Homebrew/linkage_checker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "keg"
 require "formula"
 require "linkage_cache_store"
diff --git a/Library/Homebrew/load_path.rb b/Library/Homebrew/load_path.rb
index d465c8db8..c3eb98356 100644
--- a/Library/Homebrew/load_path.rb
+++ b/Library/Homebrew/load_path.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "pathname"
 
 HOMEBREW_LIBRARY_PATH = Pathname(__dir__).realpath.freeze
diff --git a/Library/Homebrew/locale.rb b/Library/Homebrew/locale.rb
index 4c05be5be..d9c520959 100644
--- a/Library/Homebrew/locale.rb
+++ b/Library/Homebrew/locale.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Locale
   class ParserError < StandardError
   end
diff --git a/Library/Homebrew/lock_file.rb b/Library/Homebrew/lock_file.rb
index c694c6222..99c1afda5 100644
--- a/Library/Homebrew/lock_file.rb
+++ b/Library/Homebrew/lock_file.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "fcntl"
 
 class LockFile
diff --git a/Library/Homebrew/messages.rb b/Library/Homebrew/messages.rb
index 55cf10264..8ecd36d08 100644
--- a/Library/Homebrew/messages.rb
+++ b/Library/Homebrew/messages.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # A Messages object collects messages that may need to be displayed together
 # at the end of a multi-step `brew` command run.
 class Messages
diff --git a/Library/Homebrew/metafiles.rb b/Library/Homebrew/metafiles.rb
index 963f5c45b..5159623f1 100644
--- a/Library/Homebrew/metafiles.rb
+++ b/Library/Homebrew/metafiles.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Metafiles
   # https://github.com/github/markup#markups
   EXTENSIONS = Set.new(%w[
diff --git a/Library/Homebrew/migrator.rb b/Library/Homebrew/migrator.rb
index 60bb0ce71..0c11faad7 100644
--- a/Library/Homebrew/migrator.rb
+++ b/Library/Homebrew/migrator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "lock_file"
 require "keg"
 require "tab"
diff --git a/Library/Homebrew/missing_formula.rb b/Library/Homebrew/missing_formula.rb
index 2ab03c4c5..7fe246c33 100644
--- a/Library/Homebrew/missing_formula.rb
+++ b/Library/Homebrew/missing_formula.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formulary"
 require "cask/cmd/abstract_command"
 require "cask/cmd/info"
@@ -198,9 +200,9 @@ module Homebrew
         return if silent
 
         cask = Cask::CaskLoader.load(name)
-        reason = "Found a cask named \"#{name}\" instead.\n"
+        reason = +"Found a cask named \"#{name}\" instead.\n"
         reason << Cask::Cmd::Info.get_info(cask) if show_info
-        reason
+        reason.freeze
       rescue Cask::CaskUnavailableError
         nil
       end
diff --git a/Library/Homebrew/mktemp.rb b/Library/Homebrew/mktemp.rb
index 2a8d698b4..716c3d269 100644
--- a/Library/Homebrew/mktemp.rb
+++ b/Library/Homebrew/mktemp.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Performs `Formula#mktemp`'s functionality, and tracks the results.
 # Each instance is only intended to be used once.
 class Mktemp
diff --git a/Library/Homebrew/official_taps.rb b/Library/Homebrew/official_taps.rb
index 74059c908..44fb54250 100644
--- a/Library/Homebrew/official_taps.rb
+++ b/Library/Homebrew/official_taps.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 OFFICIAL_CASK_TAPS = %w[
   cask
   versions
diff --git a/Library/Homebrew/options.rb b/Library/Homebrew/options.rb
index fa043c4a9..c386c2ee4 100644
--- a/Library/Homebrew/options.rb
+++ b/Library/Homebrew/options.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Option
   attr_reader :name, :description, :flag
 
diff --git a/Library/Homebrew/os.rb b/Library/Homebrew/os.rb
index 44e169485..2108c279d 100644
--- a/Library/Homebrew/os.rb
+++ b/Library/Homebrew/os.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module OS
   def self.mac?
     return false if ENV["HOMEBREW_TEST_GENERIC_OS"]
@@ -20,12 +22,12 @@ module OS
        !OS::Mac.outdated_release? &&
        ARGV.none? { |v| v.start_with?("--cc=") } &&
        ENV["HOMEBREW_PREFIX"] == "/usr/local"
-      ISSUES_URL = "https://docs.brew.sh/Troubleshooting".freeze
+      ISSUES_URL = "https://docs.brew.sh/Troubleshooting"
     end
-    PATH_OPEN = "/usr/bin/open".freeze
+    PATH_OPEN = "/usr/bin/open"
   elsif OS.linux?
     require "os/linux"
-    ISSUES_URL = "https://docs.brew.sh/Troubleshooting".freeze
-    PATH_OPEN = "xdg-open".freeze
+    ISSUES_URL = "https://docs.brew.sh/Troubleshooting"
+    PATH_OPEN = "xdg-open"
   end
 end
diff --git a/Library/Homebrew/os/global.rb b/Library/Homebrew/os/global.rb
index 7808b7e5b..9d6250c23 100644
--- a/Library/Homebrew/os/global.rb
+++ b/Library/Homebrew/os/global.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "os/linux/global" if OS.linux?
diff --git a/Library/Homebrew/os/linux.rb b/Library/Homebrew/os/linux.rb
index af0c598b2..cc26893e7 100644
--- a/Library/Homebrew/os/linux.rb
+++ b/Library/Homebrew/os/linux.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module OS
   # Define OS::Mac on Linux for formula API compatibility.
   module Mac
diff --git a/Library/Homebrew/os/linux/diagnostic.rb b/Library/Homebrew/os/linux/diagnostic.rb
index 66cd7fe8a..1844c658e 100644
--- a/Library/Homebrew/os/linux/diagnostic.rb
+++ b/Library/Homebrew/os/linux/diagnostic.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Homebrew
   module Diagnostic
     class Checks
diff --git a/Library/Homebrew/os/linux/elf.rb b/Library/Homebrew/os/linux/elf.rb
index b7a1fcb72..4e3a99a49 100644
--- a/Library/Homebrew/os/linux/elf.rb
+++ b/Library/Homebrew/os/linux/elf.rb
@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 # @see https://en.wikipedia.org/wiki/Executable_and_Linkable_Format#File_header
 module ELFShim
   MAGIC_NUMBER_OFFSET = 0
-  MAGIC_NUMBER_ASCII = "\x7fELF".freeze
+  MAGIC_NUMBER_ASCII = "\x7fELF"
 
   OS_ABI_OFFSET = 0x07
   OS_ABI_SYSTEM_V = 0
diff --git a/Library/Homebrew/os/linux/glibc.rb b/Library/Homebrew/os/linux/glibc.rb
index 0d7397c9c..8a7fa5250 100644
--- a/Library/Homebrew/os/linux/glibc.rb
+++ b/Library/Homebrew/os/linux/glibc.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module OS
   module Linux
     module Glibc
diff --git a/Library/Homebrew/os/linux/global.rb b/Library/Homebrew/os/linux/global.rb
index 893cec29e..a4d7e2c0e 100644
--- a/Library/Homebrew/os/linux/global.rb
+++ b/Library/Homebrew/os/linux/global.rb
@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 module Homebrew
   DEFAULT_PREFIX ||= if ENV["HOMEBREW_FORCE_HOMEBREW_ON_LINUX"]
-    "/usr/local".freeze
+    "/usr/local"
   else
-    "/home/linuxbrew/.linuxbrew".freeze
+    "/home/linuxbrew/.linuxbrew"
   end.freeze
 end
diff --git a/Library/Homebrew/os/linux/kernel.rb b/Library/Homebrew/os/linux/kernel.rb
index 4534409e6..b35927dd3 100644
--- a/Library/Homebrew/os/linux/kernel.rb
+++ b/Library/Homebrew/os/linux/kernel.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module OS
   module Linux
     module Kernel
diff --git a/Library/Homebrew/os/mac.rb b/Library/Homebrew/os/mac.rb
index 3f800e702..078e3fd0c 100644
--- a/Library/Homebrew/os/mac.rb
+++ b/Library/Homebrew/os/mac.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "os/mac/version"
 require "os/mac/xcode"
 require "os/mac/xquartz"
diff --git a/Library/Homebrew/os/mac/architecture_list.rb b/Library/Homebrew/os/mac/architecture_list.rb
index aa3c035b7..8ade3fe0c 100644
--- a/Library/Homebrew/os/mac/architecture_list.rb
+++ b/Library/Homebrew/os/mac/architecture_list.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "hardware"
 
 module ArchitectureListExtension
diff --git a/Library/Homebrew/os/mac/keg.rb b/Library/Homebrew/os/mac/keg.rb
index 631a69916..65d4ceb02 100644
--- a/Library/Homebrew/os/mac/keg.rb
+++ b/Library/Homebrew/os/mac/keg.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Keg
   def change_dylib_id(id, file)
     return if file.dylib_id == id
diff --git a/Library/Homebrew/os/mac/mach.rb b/Library/Homebrew/os/mac/mach.rb
index 4e7c86e98..aa8baa542 100644
--- a/Library/Homebrew/os/mac/mach.rb
+++ b/Library/Homebrew/os/mac/mach.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "macho"
 require "os/mac/architecture_list"
 
diff --git a/Library/Homebrew/os/mac/sdk.rb b/Library/Homebrew/os/mac/sdk.rb
index 1bae724ee..1fa1356f8 100644
--- a/Library/Homebrew/os/mac/sdk.rb
+++ b/Library/Homebrew/os/mac/sdk.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "os/mac/version"
 
 module OS
diff --git a/Library/Homebrew/os/mac/version.rb b/Library/Homebrew/os/mac/version.rb
index 4527bdafe..f0652cf8c 100644
--- a/Library/Homebrew/os/mac/version.rb
+++ b/Library/Homebrew/os/mac/version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "version"
 
 module OS
diff --git a/Library/Homebrew/os/mac/xcode.rb b/Library/Homebrew/os/mac/xcode.rb
index 536e20cd9..194bf237b 100644
--- a/Library/Homebrew/os/mac/xcode.rb
+++ b/Library/Homebrew/os/mac/xcode.rb
@@ -1,11 +1,13 @@
+# frozen_string_literal: true
+
 module OS
   module Mac
     module Xcode
       module_function
 
       DEFAULT_BUNDLE_PATH = Pathname.new("/Applications/Xcode.app").freeze
-      BUNDLE_ID = "com.apple.dt.Xcode".freeze
-      OLD_BUNDLE_ID = "com.apple.Xcode".freeze
+      BUNDLE_ID = "com.apple.dt.Xcode"
+      OLD_BUNDLE_ID = "com.apple.Xcode"
 
       def latest_version
         case MacOS.version
@@ -185,12 +187,12 @@ module OS
       module_function
 
       # The original Mavericks CLT package ID
-      EXECUTABLE_PKG_ID = "com.apple.pkg.CLTools_Executables".freeze
-      MAVERICKS_NEW_PKG_ID = "com.apple.pkg.CLTools_Base".freeze # obsolete
-      PKG_PATH = "/Library/Developer/CommandLineTools".freeze
+      EXECUTABLE_PKG_ID = "com.apple.pkg.CLTools_Executables"
+      MAVERICKS_NEW_PKG_ID = "com.apple.pkg.CLTools_Base" # obsolete
+      PKG_PATH = "/Library/Developer/CommandLineTools"
       HEADER_PKG_PATH =
-        "/Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_:macos_version.pkg".freeze
-      HEADER_PKG_ID = "com.apple.pkg.macOS_SDK_headers_for_macOS_10.14".freeze
+        "/Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_:macos_version.pkg"
+      HEADER_PKG_ID = "com.apple.pkg.macOS_SDK_headers_for_macOS_10.14"
 
       # Returns true even if outdated tools are installed
       def installed?
diff --git a/Library/Homebrew/os/mac/xquartz.rb b/Library/Homebrew/os/mac/xquartz.rb
index 566adb912..5df711276 100644
--- a/Library/Homebrew/os/mac/xquartz.rb
+++ b/Library/Homebrew/os/mac/xquartz.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module OS
   module Mac
     X11 = XQuartz = Module.new # rubocop:disable Style/MutableConstant
@@ -6,8 +8,8 @@ module OS
       module_function
 
       DEFAULT_BUNDLE_PATH = Pathname.new("Applications/Utilities/XQuartz.app").freeze
-      FORGE_BUNDLE_ID = "org.macosforge.xquartz.X11".freeze
-      FORGE_PKG_ID = "org.macosforge.xquartz.pkg".freeze
+      FORGE_BUNDLE_ID = "org.macosforge.xquartz.X11"
+      FORGE_PKG_ID = "org.macosforge.xquartz.pkg"
 
       PKGINFO_VERSION_MAP = {
         "2.6.34"  => "2.6.3",
diff --git a/Library/Homebrew/patch.rb b/Library/Homebrew/patch.rb
index 94d037726..8f0d5a5c0 100644
--- a/Library/Homebrew/patch.rb
+++ b/Library/Homebrew/patch.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "resource"
 require "erb"
 
diff --git a/Library/Homebrew/pkg_version.rb b/Library/Homebrew/pkg_version.rb
index 8838a996a..43b45d60e 100644
--- a/Library/Homebrew/pkg_version.rb
+++ b/Library/Homebrew/pkg_version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "version"
 
 class PkgVersion
diff --git a/Library/Homebrew/postinstall.rb b/Library/Homebrew/postinstall.rb
index 94c56e48f..3498e03d6 100644
--- a/Library/Homebrew/postinstall.rb
+++ b/Library/Homebrew/postinstall.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 old_trap = trap("INT") { exit! 130 }
 
 require "global"
diff --git a/Library/Homebrew/readall.rb b/Library/Homebrew/readall.rb
index de1ece8d6..327bcef52 100644
--- a/Library/Homebrew/readall.rb
+++ b/Library/Homebrew/readall.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 
 module Readall
diff --git a/Library/Homebrew/reinstall.rb b/Library/Homebrew/reinstall.rb
index fd131e84c..088be0faf 100644
--- a/Library/Homebrew/reinstall.rb
+++ b/Library/Homebrew/reinstall.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula_installer"
 require "development_tools"
 require "messages"
diff --git a/Library/Homebrew/requirement.rb b/Library/Homebrew/requirement.rb
index 9474aabfd..ebd2179a2 100644
--- a/Library/Homebrew/requirement.rb
+++ b/Library/Homebrew/requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "dependable"
 require "dependency"
 require "dependencies"
diff --git a/Library/Homebrew/requirements.rb b/Library/Homebrew/requirements.rb
index 0173017e8..cf7cf6be8 100644
--- a/Library/Homebrew/requirements.rb
+++ b/Library/Homebrew/requirements.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirement"
 require "requirements/arch_requirement"
 require "requirements/codesign_requirement"
diff --git a/Library/Homebrew/requirements/arch_requirement.rb b/Library/Homebrew/requirements/arch_requirement.rb
index 9a28daa46..03a988c76 100644
--- a/Library/Homebrew/requirements/arch_requirement.rb
+++ b/Library/Homebrew/requirements/arch_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirement"
 
 class ArchRequirement < Requirement
diff --git a/Library/Homebrew/requirements/codesign_requirement.rb b/Library/Homebrew/requirements/codesign_requirement.rb
index aaf4f650f..9a48f204b 100644
--- a/Library/Homebrew/requirements/codesign_requirement.rb
+++ b/Library/Homebrew/requirements/codesign_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CodesignRequirement < Requirement
   fatal true
 
diff --git a/Library/Homebrew/requirements/java_requirement.rb b/Library/Homebrew/requirements/java_requirement.rb
index 76992fcfa..d563ac547 100644
--- a/Library/Homebrew/requirements/java_requirement.rb
+++ b/Library/Homebrew/requirements/java_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "language/java"
 
 class JavaRequirement < Requirement
diff --git a/Library/Homebrew/requirements/linux_requirement.rb b/Library/Homebrew/requirements/linux_requirement.rb
index cb4666e56..74daf4cf4 100644
--- a/Library/Homebrew/requirements/linux_requirement.rb
+++ b/Library/Homebrew/requirements/linux_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class LinuxRequirement < Requirement
   fatal true
 
diff --git a/Library/Homebrew/requirements/macos_requirement.rb b/Library/Homebrew/requirements/macos_requirement.rb
index 7f40d37fe..d984efc6e 100644
--- a/Library/Homebrew/requirements/macos_requirement.rb
+++ b/Library/Homebrew/requirements/macos_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirement"
 
 class MacOSRequirement < Requirement
diff --git a/Library/Homebrew/requirements/maximum_macos_requirement.rb b/Library/Homebrew/requirements/maximum_macos_requirement.rb
index 4dd7fd73d..415f862ed 100644
--- a/Library/Homebrew/requirements/maximum_macos_requirement.rb
+++ b/Library/Homebrew/requirements/maximum_macos_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirement"
 
 class MaximumMacOSRequirement < Requirement
diff --git a/Library/Homebrew/requirements/osxfuse_requirement.rb b/Library/Homebrew/requirements/osxfuse_requirement.rb
index 2e67a4b05..79712de53 100644
--- a/Library/Homebrew/requirements/osxfuse_requirement.rb
+++ b/Library/Homebrew/requirements/osxfuse_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirement"
 
 class OsxfuseRequirement < Requirement
diff --git a/Library/Homebrew/requirements/tuntap_requirement.rb b/Library/Homebrew/requirements/tuntap_requirement.rb
index 3ae142080..80b842977 100644
--- a/Library/Homebrew/requirements/tuntap_requirement.rb
+++ b/Library/Homebrew/requirements/tuntap_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirement"
 
 class TuntapRequirement < Requirement
diff --git a/Library/Homebrew/requirements/x11_requirement.rb b/Library/Homebrew/requirements/x11_requirement.rb
index 539d37480..58ecf33cf 100644
--- a/Library/Homebrew/requirements/x11_requirement.rb
+++ b/Library/Homebrew/requirements/x11_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirement"
 
 class X11Requirement < Requirement
diff --git a/Library/Homebrew/requirements/xcode_requirement.rb b/Library/Homebrew/requirements/xcode_requirement.rb
index 8d596fbf4..caeb67724 100644
--- a/Library/Homebrew/requirements/xcode_requirement.rb
+++ b/Library/Homebrew/requirements/xcode_requirement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirement"
 
 class XcodeRequirement < Requirement
diff --git a/Library/Homebrew/resource.rb b/Library/Homebrew/resource.rb
index 1ca20ee2b..b4c32f173 100644
--- a/Library/Homebrew/resource.rb
+++ b/Library/Homebrew/resource.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "download_strategy"
 require "checksum"
 require "version"
diff --git a/Library/Homebrew/rubocops.rb b/Library/Homebrew/rubocops.rb
index 78e4a92e0..b3a1fabbe 100644
--- a/Library/Homebrew/rubocops.rb
+++ b/Library/Homebrew/rubocops.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "load_path"
 
 require "rubocop-rspec"
diff --git a/Library/Homebrew/rubocops/cask/ast/cask_block.rb b/Library/Homebrew/rubocops/cask/ast/cask_block.rb
index bc8db9590..98e97c0c3 100644
--- a/Library/Homebrew/rubocops/cask/ast/cask_block.rb
+++ b/Library/Homebrew/rubocops/cask/ast/cask_block.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "forwardable"
 
 module RuboCop
diff --git a/Library/Homebrew/rubocops/cask/ast/cask_header.rb b/Library/Homebrew/rubocops/cask/ast/cask_header.rb
index 475dd2d8f..8668c2daa 100644
--- a/Library/Homebrew/rubocops/cask/ast/cask_header.rb
+++ b/Library/Homebrew/rubocops/cask/ast/cask_header.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RuboCop
   module Cask
     module AST
diff --git a/Library/Homebrew/rubocops/cask/ast/stanza.rb b/Library/Homebrew/rubocops/cask/ast/stanza.rb
index c81e560c2..8a6b7a545 100644
--- a/Library/Homebrew/rubocops/cask/ast/stanza.rb
+++ b/Library/Homebrew/rubocops/cask/ast/stanza.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "forwardable"
 
 module RuboCop
diff --git a/Library/Homebrew/rubocops/cask/constants/stanza.rb b/Library/Homebrew/rubocops/cask/constants/stanza.rb
index 0cdfef8ba..ad7b41ce4 100644
--- a/Library/Homebrew/rubocops/cask/constants/stanza.rb
+++ b/Library/Homebrew/rubocops/cask/constants/stanza.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RuboCop
   module Cask
     # Constants available globally for use in all Cask cops.
diff --git a/Library/Homebrew/rubocops/cask/extend/node.rb b/Library/Homebrew/rubocops/cask/extend/node.rb
index f8c365d21..8e179e70d 100644
--- a/Library/Homebrew/rubocops/cask/extend/node.rb
+++ b/Library/Homebrew/rubocops/cask/extend/node.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RuboCop
   module AST
     # Extensions for RuboCop's AST Node class
diff --git a/Library/Homebrew/rubocops/cask/extend/string.rb b/Library/Homebrew/rubocops/cask/extend/string.rb
index 45d50157d..73ac1a98b 100644
--- a/Library/Homebrew/rubocops/cask/extend/string.rb
+++ b/Library/Homebrew/rubocops/cask/extend/string.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Utility method extensions for String
 class String
   def undent
diff --git a/Library/Homebrew/rubocops/cask/homepage_matches_url.rb b/Library/Homebrew/rubocops/cask/homepage_matches_url.rb
index ddd020f56..850132129 100644
--- a/Library/Homebrew/rubocops/cask/homepage_matches_url.rb
+++ b/Library/Homebrew/rubocops/cask/homepage_matches_url.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "forwardable"
 
 module RuboCop
@@ -13,11 +15,11 @@ module RuboCop
 
         REFERENCE_URL =
           "https://github.com/Homebrew/homebrew-cask/blob/master/doc/" \
-          "cask_language_reference/stanzas/url.md#when-url-and-homepage-hostnames-differ-add-a-comment".freeze
+          "cask_language_reference/stanzas/url.md#when-url-and-homepage-hostnames-differ-add-a-comment"
 
         COMMENT_FORMAT = /# [^ ]+ was verified as official when first introduced to the cask/.freeze
 
-        MSG_NO_MATCH = "`%{url}` does not match `%{full_url}`".freeze
+        MSG_NO_MATCH = "`%{url}` does not match `%{full_url}`"
 
         MSG_MISSING = ("`%{domain}` does not match `%{homepage}`, a comment has to be added " \
                       "above the `url` stanza. For details, see " + REFERENCE_URL).freeze
@@ -26,7 +28,7 @@ module RuboCop
                            "For details, see " + REFERENCE_URL).freeze
 
         MSG_UNNECESSARY = "The URL's domain `%{domain}` matches the homepage `%{homepage}`, " \
-                          "the comment above the `url` stanza is unnecessary".freeze
+                          "the comment above the `url` stanza is unnecessary"
 
         def on_cask(cask_block)
           @cask_block = cask_block
diff --git a/Library/Homebrew/rubocops/cask/homepage_url_trailing_slash.rb b/Library/Homebrew/rubocops/cask/homepage_url_trailing_slash.rb
index 267ecad2c..ab7f0987a 100644
--- a/Library/Homebrew/rubocops/cask/homepage_url_trailing_slash.rb
+++ b/Library/Homebrew/rubocops/cask/homepage_url_trailing_slash.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "forwardable"
 require "uri"
 
@@ -9,7 +11,7 @@ module RuboCop
       class HomepageUrlTrailingSlash < Cop
         include OnHomepageStanza
 
-        MSG_NO_SLASH = "'%{url}' must have a slash after the domain.".freeze
+        MSG_NO_SLASH = "'%{url}' must have a slash after the domain."
 
         def on_homepage_stanza(stanza)
           url_node = stanza.stanza_node.first_argument
diff --git a/Library/Homebrew/rubocops/cask/mixin/cask_help.rb b/Library/Homebrew/rubocops/cask/mixin/cask_help.rb
index a8ffea470..9dc0800c9 100644
--- a/Library/Homebrew/rubocops/cask/mixin/cask_help.rb
+++ b/Library/Homebrew/rubocops/cask/mixin/cask_help.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RuboCop
   module Cop
     module Cask
diff --git a/Library/Homebrew/rubocops/cask/mixin/on_homepage_stanza.rb b/Library/Homebrew/rubocops/cask/mixin/on_homepage_stanza.rb
index 0656bcb52..24d65737c 100644
--- a/Library/Homebrew/rubocops/cask/mixin/on_homepage_stanza.rb
+++ b/Library/Homebrew/rubocops/cask/mixin/on_homepage_stanza.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RuboCop
   module Cop
     module Cask
diff --git a/Library/Homebrew/rubocops/cask/no_dsl_version.rb b/Library/Homebrew/rubocops/cask/no_dsl_version.rb
index ba6dc3f2c..8fcdd4435 100644
--- a/Library/Homebrew/rubocops/cask/no_dsl_version.rb
+++ b/Library/Homebrew/rubocops/cask/no_dsl_version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "forwardable"
 
 module RuboCop
@@ -19,7 +21,7 @@ module RuboCop
         extend Forwardable
         include CaskHelp
 
-        MESSAGE = "Use `%{preferred}` instead of `%{current}`".freeze
+        MESSAGE = "Use `%{preferred}` instead of `%{current}`"
 
         def on_cask(cask_block)
           @cask_header = cask_block.header
diff --git a/Library/Homebrew/rubocops/cask/stanza_grouping.rb b/Library/Homebrew/rubocops/cask/stanza_grouping.rb
index 279e3d06b..631d2c7e2 100644
--- a/Library/Homebrew/rubocops/cask/stanza_grouping.rb
+++ b/Library/Homebrew/rubocops/cask/stanza_grouping.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "forwardable"
 
 module RuboCop
@@ -12,10 +14,10 @@ module RuboCop
         include RangeHelp
 
         MISSING_LINE_MSG = "stanza groups should be separated by a single " \
-                           "empty line".freeze
+                           "empty line"
 
         EXTRA_LINE_MSG = "stanzas within the same group should have no lines " \
-                         "between them".freeze
+                         "between them"
 
         def on_cask(cask_block)
           @cask_block = cask_block
diff --git a/Library/Homebrew/rubocops/cask/stanza_order.rb b/Library/Homebrew/rubocops/cask/stanza_order.rb
index 0de2e88b7..0c960e843 100644
--- a/Library/Homebrew/rubocops/cask/stanza_order.rb
+++ b/Library/Homebrew/rubocops/cask/stanza_order.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "forwardable"
 
 module RuboCop
@@ -10,7 +12,7 @@ module RuboCop
         extend Forwardable
         include CaskHelp
 
-        MESSAGE = "`%{stanza}` stanza out of order".freeze
+        MESSAGE = "`%{stanza}` stanza out of order"
 
         def on_cask(cask_block)
           @cask_block = cask_block
diff --git a/Library/Homebrew/rubocops/caveats.rb b/Library/Homebrew/rubocops/caveats.rb
index 6b6550a6e..09233e48e 100644
--- a/Library/Homebrew/rubocops/caveats.rb
+++ b/Library/Homebrew/rubocops/caveats.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/extend/formula"
 
 module RuboCop
diff --git a/Library/Homebrew/rubocops/checksum.rb b/Library/Homebrew/rubocops/checksum.rb
index 3eb213eba..4feff95e1 100644
--- a/Library/Homebrew/rubocops/checksum.rb
+++ b/Library/Homebrew/rubocops/checksum.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/extend/formula"
 
 module RuboCop
diff --git a/Library/Homebrew/rubocops/class.rb b/Library/Homebrew/rubocops/class.rb
index bba73ea67..ab5edf01b 100644
--- a/Library/Homebrew/rubocops/class.rb
+++ b/Library/Homebrew/rubocops/class.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/extend/formula"
 
 module RuboCop
diff --git a/Library/Homebrew/rubocops/components_order.rb b/Library/Homebrew/rubocops/components_order.rb
index c60a4c49f..709f0fa1b 100644
--- a/Library/Homebrew/rubocops/components_order.rb
+++ b/Library/Homebrew/rubocops/components_order.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/extend/formula"
 
 module RuboCop
diff --git a/Library/Homebrew/rubocops/components_redundancy.rb b/Library/Homebrew/rubocops/components_redundancy.rb
index 1a192d178..d0d6298d5 100644
--- a/Library/Homebrew/rubocops/components_redundancy.rb
+++ b/Library/Homebrew/rubocops/components_redundancy.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/extend/formula"
 
 module RuboCop
@@ -11,9 +13,9 @@ module RuboCop
       # - `stable do` should not be present without a `head` or `devel` spec
 
       class ComponentsRedundancy < FormulaCop
-        HEAD_MSG = "`head` and `head do` should not be simultaneously present".freeze
-        BOTTLE_MSG = "`bottle :modifier` and `bottle do` should not be simultaneously present".freeze
-        STABLE_MSG = "`stable do` should not be present without a `head` or `devel` spec".freeze
+        HEAD_MSG = "`head` and `head do` should not be simultaneously present"
+        BOTTLE_MSG = "`bottle :modifier` and `bottle do` should not be simultaneously present"
+        STABLE_MSG = "`stable do` should not be present without a `head` or `devel` spec"
 
         def audit_formula(_node, _class_node, _parent_class_node, body_node)
           stable_block = find_block(body_node, :stable)
diff --git a/Library/Homebrew/rubocops/conflicts.rb b/Library/Homebrew/rubocops/conflicts.rb
index 6dfe46901..ce7385c42 100644
--- a/Library/Homebrew/rubocops/conflicts.rb
+++ b/Library/Homebrew/rubocops/conflicts.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/extend/formula"
 require "extend/string"
 
@@ -7,7 +9,7 @@ module RuboCop
       # This cop audits versioned Formulae for `conflicts_with`.
       class Conflicts < FormulaCop
         MSG = "Versioned formulae should not use `conflicts_with`. " \
-              "Use `keg_only :versioned_formula` instead.".freeze
+              "Use `keg_only :versioned_formula` instead."
 
         WHITELIST = %w[
           bash-completion@
diff --git a/Library/Homebrew/rubocops/dependency_order.rb b/Library/Homebrew/rubocops/dependency_order.rb
index 1b7fac34a..1b70f6721 100644
--- a/Library/Homebrew/rubocops/dependency_order.rb
+++ b/Library/Homebrew/rubocops/dependency_order.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/extend/formula"
 
 module RuboCop
diff --git a/Library/Homebrew/rubocops/extend/formula.rb b/Library/Homebrew/rubocops/extend/formula.rb
index 4db4eff87..41ea92d2d 100644
--- a/Library/Homebrew/rubocops/extend/formula.rb
+++ b/Library/Homebrew/rubocops/extend/formula.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Silence compatibility warning.
 begin
   old_verbosity = $VERBOSE
diff --git a/Library/Homebrew/rubocops/formula_desc.rb b/Library/Homebrew/rubocops/formula_desc.rb
index ba5608cce..ee6673b0d 100644
--- a/Library/Homebrew/rubocops/formula_desc.rb
+++ b/Library/Homebrew/rubocops/formula_desc.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/extend/formula"
 require "extend/string"
 
diff --git a/Library/Homebrew/rubocops/homepage.rb b/Library/Homebrew/rubocops/homepage.rb
index 8038e786c..53f06405c 100644
--- a/Library/Homebrew/rubocops/homepage.rb
+++ b/Library/Homebrew/rubocops/homepage.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/extend/formula"
 
 module RuboCop
diff --git a/Library/Homebrew/rubocops/lines.rb b/Library/Homebrew/rubocops/lines.rb
index 718f5f806..3e9f8a9cc 100644
--- a/Library/Homebrew/rubocops/lines.rb
+++ b/Library/Homebrew/rubocops/lines.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/extend/formula"
 
 module RuboCop
diff --git a/Library/Homebrew/rubocops/options.rb b/Library/Homebrew/rubocops/options.rb
index a5a0c5e87..665803212 100644
--- a/Library/Homebrew/rubocops/options.rb
+++ b/Library/Homebrew/rubocops/options.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/extend/formula"
 
 module RuboCop
@@ -5,11 +7,11 @@ module RuboCop
     module FormulaAudit
       # This cop audits `options` in Formulae.
       class Options < FormulaCop
-        DEPRECATION_MSG = "macOS has been 64-bit only since 10.6 so 32-bit options are deprecated.".freeze
-        UNI_DEPRECATION_MSG = "macOS has been 64-bit only since 10.6 so universal options are deprecated.".freeze
+        DEPRECATION_MSG = "macOS has been 64-bit only since 10.6 so 32-bit options are deprecated."
+        UNI_DEPRECATION_MSG = "macOS has been 64-bit only since 10.6 so universal options are deprecated."
 
-        DEP_OPTION = "Formulae should not use `deprecated_option`".freeze
-        OPTION = "Formulae should not have an `option`".freeze
+        DEP_OPTION = "Formulae should not use `deprecated_option`"
+        OPTION = "Formulae should not have an `option`"
 
         def audit_formula(_node, _class_node, _parent_class_node, body_node)
           option_call_nodes = find_every_method_call_by_name(body_node, :option)
diff --git a/Library/Homebrew/rubocops/patches.rb b/Library/Homebrew/rubocops/patches.rb
index 7e912fd30..c5494b037 100644
--- a/Library/Homebrew/rubocops/patches.rb
+++ b/Library/Homebrew/rubocops/patches.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/extend/formula"
 require "extend/string"
 
diff --git a/Library/Homebrew/rubocops/rubocop-cask.rb b/Library/Homebrew/rubocops/rubocop-cask.rb
index f528e59b4..3af610ebe 100644
--- a/Library/Homebrew/rubocops/rubocop-cask.rb
+++ b/Library/Homebrew/rubocops/rubocop-cask.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocop"
 
 require "rubocops/cask/constants/stanza"
diff --git a/Library/Homebrew/rubocops/text.rb b/Library/Homebrew/rubocops/text.rb
index 78cffd711..482c1a0aa 100644
--- a/Library/Homebrew/rubocops/text.rb
+++ b/Library/Homebrew/rubocops/text.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/extend/formula"
 
 module RuboCop
diff --git a/Library/Homebrew/rubocops/urls.rb b/Library/Homebrew/rubocops/urls.rb
index 83fb8798f..774364d68 100644
--- a/Library/Homebrew/rubocops/urls.rb
+++ b/Library/Homebrew/rubocops/urls.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/extend/formula"
 
 module RuboCop
diff --git a/Library/Homebrew/sandbox.rb b/Library/Homebrew/sandbox.rb
index 413347023..2fd0ae13b 100644
--- a/Library/Homebrew/sandbox.rb
+++ b/Library/Homebrew/sandbox.rb
@@ -1,8 +1,10 @@
+# frozen_string_literal: true
+
 require "erb"
 require "tempfile"
 
 class Sandbox
-  SANDBOX_EXEC = "/usr/bin/sandbox-exec".freeze
+  SANDBOX_EXEC = "/usr/bin/sandbox-exec"
 
   def self.available?
     OS.mac? && File.executable?(SANDBOX_EXEC)
@@ -150,7 +152,7 @@ class Sandbox
   end
 
   class SandboxProfile
-    SEATBELT_ERB = <<~ERB.freeze
+    SEATBELT_ERB = <<~ERB
       (version 1)
       (debug deny) ; log all denied operations to /var/log/system.log
       <%= rules.join("\n") %>
diff --git a/Library/Homebrew/search.rb b/Library/Homebrew/search.rb
index 8d6e8f012..1da53e64a 100644
--- a/Library/Homebrew/search.rb
+++ b/Library/Homebrew/search.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "searchable"
 require "description_cache_store"
 
diff --git a/Library/Homebrew/searchable.rb b/Library/Homebrew/searchable.rb
index 72079b216..05b00d98f 100644
--- a/Library/Homebrew/searchable.rb
+++ b/Library/Homebrew/searchable.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Searchable
   def search(string_or_regex, &block)
     case string_or_regex
diff --git a/Library/Homebrew/software_spec.rb b/Library/Homebrew/software_spec.rb
index 2e17a9882..2ea629de8 100644
--- a/Library/Homebrew/software_spec.rb
+++ b/Library/Homebrew/software_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "resource"
 require "checksum"
 require "version"
diff --git a/Library/Homebrew/style.rb b/Library/Homebrew/style.rb
index f4d53e5a1..a0b97c00b 100644
--- a/Library/Homebrew/style.rb
+++ b/Library/Homebrew/style.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Homebrew
   module Style
     module_function
diff --git a/Library/Homebrew/system_command.rb b/Library/Homebrew/system_command.rb
index fe2ca7dc4..e365ec1ab 100644
--- a/Library/Homebrew/system_command.rb
+++ b/Library/Homebrew/system_command.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "open3"
 require "ostruct"
 require "plist"
diff --git a/Library/Homebrew/system_config.rb b/Library/Homebrew/system_config.rb
index 14ab93d0f..50853070f 100644
--- a/Library/Homebrew/system_config.rb
+++ b/Library/Homebrew/system_config.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "hardware"
 require "software_spec"
 require "rexml/document"
diff --git a/Library/Homebrew/tab.rb b/Library/Homebrew/tab.rb
index 28c3e6594..b6a208a6d 100644
--- a/Library/Homebrew/tab.rb
+++ b/Library/Homebrew/tab.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cxxstdlib"
 require "ostruct"
 require "options"
@@ -12,7 +14,7 @@ require "extend/cachable"
 class Tab < OpenStruct
   extend Cachable
 
-  FILENAME = "INSTALL_RECEIPT.json".freeze
+  FILENAME = "INSTALL_RECEIPT.json"
 
   # Instantiates a Tab for a new installation of a formula.
   def self.create(formula, compiler, stdlib)
diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index c395f94db..0d9cacdb6 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "extend/cachable"
 require "readall"
 require "description_cache_store"
diff --git a/Library/Homebrew/tap_constants.rb b/Library/Homebrew/tap_constants.rb
index 0c6bd3adc..c375ba8dc 100644
--- a/Library/Homebrew/tap_constants.rb
+++ b/Library/Homebrew/tap_constants.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # match taps' formulae, e.g. someuser/sometap/someformula
 HOMEBREW_TAP_FORMULA_REGEX = %r{^([\w-]+)/([\w-]+)/([\w+-.@]+)$}.freeze
 # match taps' casks, e.g. someuser/sometap/somecask
diff --git a/Library/Homebrew/test.rb b/Library/Homebrew/test.rb
index 92ab9dce3..11ed7f37b 100644
--- a/Library/Homebrew/test.rb
+++ b/Library/Homebrew/test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 old_trap = trap("INT") { exit! 130 }
 
 require "global"
diff --git a/Library/Homebrew/test/ARGV_spec.rb b/Library/Homebrew/test/ARGV_spec.rb
index 04944c4a1..868240a1c 100644
--- a/Library/Homebrew/test/ARGV_spec.rb
+++ b/Library/Homebrew/test/ARGV_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "extend/ARGV"
 
 describe HomebrewArgvExtension do
diff --git a/Library/Homebrew/test/ENV_spec.rb b/Library/Homebrew/test/ENV_spec.rb
index 050cfb2be..726479c64 100644
--- a/Library/Homebrew/test/ENV_spec.rb
+++ b/Library/Homebrew/test/ENV_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "extend/ENV"
 
 shared_examples EnvActivation do
diff --git a/Library/Homebrew/test/PATH_spec.rb b/Library/Homebrew/test/PATH_spec.rb
index db5df9b44..eda4461f6 100644
--- a/Library/Homebrew/test/PATH_spec.rb
+++ b/Library/Homebrew/test/PATH_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "PATH"
 
 describe PATH do
diff --git a/Library/Homebrew/test/bash_spec.rb b/Library/Homebrew/test/bash_spec.rb
index 60ce8416a..b3b552249 100644
--- a/Library/Homebrew/test/bash_spec.rb
+++ b/Library/Homebrew/test/bash_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "open3"
 
 describe "Bash" do
diff --git a/Library/Homebrew/test/bottle_filename_spec.rb b/Library/Homebrew/test/bottle_filename_spec.rb
index 6ad205c13..f7db07f96 100644
--- a/Library/Homebrew/test/bottle_filename_spec.rb
+++ b/Library/Homebrew/test/bottle_filename_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "software_spec"
 
diff --git a/Library/Homebrew/test/build_environment_spec.rb b/Library/Homebrew/test/build_environment_spec.rb
index 0675b6aae..e5bc95da3 100644
--- a/Library/Homebrew/test/build_environment_spec.rb
+++ b/Library/Homebrew/test/build_environment_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "build_environment"
 
 describe BuildEnvironment do
diff --git a/Library/Homebrew/test/build_options_spec.rb b/Library/Homebrew/test/build_options_spec.rb
index 8c60e128e..fc034eaa2 100644
--- a/Library/Homebrew/test/build_options_spec.rb
+++ b/Library/Homebrew/test/build_options_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "build_options"
 require "options"
 
diff --git a/Library/Homebrew/test/cache_store_spec.rb b/Library/Homebrew/test/cache_store_spec.rb
index fb0fbcb0a..8981b741b 100644
--- a/Library/Homebrew/test/cache_store_spec.rb
+++ b/Library/Homebrew/test/cache_store_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cache_store"
 
 describe CacheStoreDatabase do
diff --git a/Library/Homebrew/test/cask/artifact/alt_target_spec.rb b/Library/Homebrew/test/cask/artifact/alt_target_spec.rb
index b2808c420..3fdbe36cb 100644
--- a/Library/Homebrew/test/cask/artifact/alt_target_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/alt_target_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Artifact::App, :cask do
   describe "activate to alternate target" do
     let(:cask) { Cask::CaskLoader.load(cask_path("with-alt-target")) }
diff --git a/Library/Homebrew/test/cask/artifact/app_spec.rb b/Library/Homebrew/test/cask/artifact/app_spec.rb
index 14917b4f4..0b318351d 100644
--- a/Library/Homebrew/test/cask/artifact/app_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/app_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Artifact::App, :cask do
   let(:cask) { Cask::CaskLoader.load(cask_path("local-caffeine")) }
   let(:command) { SystemCommand }
diff --git a/Library/Homebrew/test/cask/artifact/binary_spec.rb b/Library/Homebrew/test/cask/artifact/binary_spec.rb
index 0aa60c38f..d905e8d8f 100644
--- a/Library/Homebrew/test/cask/artifact/binary_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/binary_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Artifact::Binary, :cask do
   let(:cask) {
     Cask::CaskLoader.load(cask_path("with-binary")).tap do |cask|
diff --git a/Library/Homebrew/test/cask/artifact/generic_artifact_spec.rb b/Library/Homebrew/test/cask/artifact/generic_artifact_spec.rb
index 83fb55fc5..c15b87851 100644
--- a/Library/Homebrew/test/cask/artifact/generic_artifact_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/generic_artifact_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Artifact::Artifact, :cask do
   let(:cask) { Cask::CaskLoader.load(cask_path("with-generic-artifact")) }
 
diff --git a/Library/Homebrew/test/cask/artifact/installer_spec.rb b/Library/Homebrew/test/cask/artifact/installer_spec.rb
index 68b0e24ed..6bff500bb 100644
--- a/Library/Homebrew/test/cask/artifact/installer_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/installer_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Artifact::Installer, :cask do
   subject(:installer) { described_class.new(cask, **args) }
 
diff --git a/Library/Homebrew/test/cask/artifact/pkg_spec.rb b/Library/Homebrew/test/cask/artifact/pkg_spec.rb
index 9d3cf6f71..19087acd9 100644
--- a/Library/Homebrew/test/cask/artifact/pkg_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/pkg_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Artifact::Pkg, :cask do
   let(:cask) { Cask::CaskLoader.load(cask_path("with-installable")) }
   let(:fake_system_command) { class_double(SystemCommand) }
diff --git a/Library/Homebrew/test/cask/artifact/postflight_block_spec.rb b/Library/Homebrew/test/cask/artifact/postflight_block_spec.rb
index 75c6d10d0..52cd1bf0c 100644
--- a/Library/Homebrew/test/cask/artifact/postflight_block_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/postflight_block_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Artifact::PostflightBlock, :cask do
   describe "install_phase" do
     it "calls the specified block after installing, passing a Cask mini-dsl" do
diff --git a/Library/Homebrew/test/cask/artifact/preflight_block_spec.rb b/Library/Homebrew/test/cask/artifact/preflight_block_spec.rb
index 8d07807f0..7546690b0 100644
--- a/Library/Homebrew/test/cask/artifact/preflight_block_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/preflight_block_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Artifact::PreflightBlock, :cask do
   describe "install_phase" do
     it "calls the specified block before installing, passing a Cask mini-dsl" do
diff --git a/Library/Homebrew/test/cask/artifact/shared_examples/uninstall_zap.rb b/Library/Homebrew/test/cask/artifact/shared_examples/uninstall_zap.rb
index 3a80e6e90..d5b3c7a99 100644
--- a/Library/Homebrew/test/cask/artifact/shared_examples/uninstall_zap.rb
+++ b/Library/Homebrew/test/cask/artifact/shared_examples/uninstall_zap.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "benchmark"
 
 shared_examples "#uninstall_phase or #zap_phase" do
diff --git a/Library/Homebrew/test/cask/artifact/suite_spec.rb b/Library/Homebrew/test/cask/artifact/suite_spec.rb
index 3f4a2d6dc..7cf983f05 100644
--- a/Library/Homebrew/test/cask/artifact/suite_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/suite_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Artifact::Suite, :cask do
   let(:cask) { Cask::CaskLoader.load(cask_path("with-suite")) }
 
diff --git a/Library/Homebrew/test/cask/artifact/two_apps_correct_spec.rb b/Library/Homebrew/test/cask/artifact/two_apps_correct_spec.rb
index 7381c832b..200823abb 100644
--- a/Library/Homebrew/test/cask/artifact/two_apps_correct_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/two_apps_correct_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Artifact::App, :cask do
   describe "multiple apps" do
     let(:cask) { Cask::CaskLoader.load(cask_path("with-two-apps-correct")) }
diff --git a/Library/Homebrew/test/cask/artifact/uninstall_no_zap_spec.rb b/Library/Homebrew/test/cask/artifact/uninstall_no_zap_spec.rb
index 863db064e..ae2cce3f9 100644
--- a/Library/Homebrew/test/cask/artifact/uninstall_no_zap_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/uninstall_no_zap_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Artifact::Zap, :cask do
   let(:cask) { Cask::CaskLoader.load(cask_path("with-installable")) }
 
diff --git a/Library/Homebrew/test/cask/artifact/uninstall_spec.rb b/Library/Homebrew/test/cask/artifact/uninstall_spec.rb
index 5d5a70c70..8996884ff 100644
--- a/Library/Homebrew/test/cask/artifact/uninstall_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/uninstall_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/uninstall_zap"
 
 describe Cask::Artifact::Uninstall, :cask do
diff --git a/Library/Homebrew/test/cask/artifact/zap_spec.rb b/Library/Homebrew/test/cask/artifact/zap_spec.rb
index 15122dda8..3c942ef57 100644
--- a/Library/Homebrew/test/cask/artifact/zap_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/zap_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/uninstall_zap"
 
 describe Cask::Artifact::Zap, :cask do
diff --git a/Library/Homebrew/test/cask/audit_spec.rb b/Library/Homebrew/test/cask/audit_spec.rb
index 06f7db4d2..41c7dbf3f 100644
--- a/Library/Homebrew/test/cask/audit_spec.rb
+++ b/Library/Homebrew/test/cask/audit_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Audit, :cask do
   def include_msg?(messages, msg)
     if msg.is_a?(Regexp)
diff --git a/Library/Homebrew/test/cask/cask_loader/from__path_loader_spec.rb b/Library/Homebrew/test/cask/cask_loader/from__path_loader_spec.rb
index ad9c85a68..36de96505 100644
--- a/Library/Homebrew/test/cask/cask_loader/from__path_loader_spec.rb
+++ b/Library/Homebrew/test/cask/cask_loader/from__path_loader_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::CaskLoader::FromPathLoader do
   describe "#load" do
     context "when the file does not contain a cask" do
diff --git a/Library/Homebrew/test/cask/cask_loader/from_content_loader_spec.rb b/Library/Homebrew/test/cask/cask_loader/from_content_loader_spec.rb
index 22f1b8530..41836b9a1 100644
--- a/Library/Homebrew/test/cask/cask_loader/from_content_loader_spec.rb
+++ b/Library/Homebrew/test/cask/cask_loader/from_content_loader_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::CaskLoader::FromContentLoader do
   alias_matcher :be_able_to_load, :be_can_load
 
diff --git a/Library/Homebrew/test/cask/cask_loader/from_uri_loader_spec.rb b/Library/Homebrew/test/cask/cask_loader/from_uri_loader_spec.rb
index 1d919aba8..cb8e02152 100644
--- a/Library/Homebrew/test/cask/cask_loader/from_uri_loader_spec.rb
+++ b/Library/Homebrew/test/cask/cask_loader/from_uri_loader_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::CaskLoader::FromURILoader do
   alias_matcher :be_able_to_load, :be_can_load
 
diff --git a/Library/Homebrew/test/cask/cask_spec.rb b/Library/Homebrew/test/cask/cask_spec.rb
index 5b0687925..986b7561c 100644
--- a/Library/Homebrew/test/cask/cask_spec.rb
+++ b/Library/Homebrew/test/cask/cask_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Cask, :cask do
   let(:cask) { described_class.new("versioned-cask") }
 
diff --git a/Library/Homebrew/test/cask/cmd/audit_spec.rb b/Library/Homebrew/test/cask/cmd/audit_spec.rb
index 529019b0c..f8269b687 100644
--- a/Library/Homebrew/test/cask/cmd/audit_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/audit_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/invalid_option"
 
 describe Cask::Cmd::Audit, :cask do
diff --git a/Library/Homebrew/test/cask/cmd/cat_spec.rb b/Library/Homebrew/test/cask/cmd/cat_spec.rb
index 8d8a761d8..5c424e6e6 100644
--- a/Library/Homebrew/test/cask/cmd/cat_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/cat_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/requires_cask_token"
 require_relative "shared_examples/invalid_option"
 
diff --git a/Library/Homebrew/test/cask/cmd/create_spec.rb b/Library/Homebrew/test/cask/cmd/create_spec.rb
index 89fc13e81..2effe846c 100644
--- a/Library/Homebrew/test/cask/cmd/create_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/create_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/requires_cask_token"
 require_relative "shared_examples/invalid_option"
 
diff --git a/Library/Homebrew/test/cask/cmd/doctor_spec.rb b/Library/Homebrew/test/cask/cmd/doctor_spec.rb
index 90aa14c93..166808389 100644
--- a/Library/Homebrew/test/cask/cmd/doctor_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/doctor_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/invalid_option"
 
 describe Cask::Cmd::Doctor, :cask do
diff --git a/Library/Homebrew/test/cask/cmd/edit_spec.rb b/Library/Homebrew/test/cask/cmd/edit_spec.rb
index 2d5f2a9a1..58f4d21e4 100644
--- a/Library/Homebrew/test/cask/cmd/edit_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/edit_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/requires_cask_token"
 require_relative "shared_examples/invalid_option"
 
diff --git a/Library/Homebrew/test/cask/cmd/fetch_spec.rb b/Library/Homebrew/test/cask/cmd/fetch_spec.rb
index 153f5bb42..35ecf6331 100644
--- a/Library/Homebrew/test/cask/cmd/fetch_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/fetch_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/requires_cask_token"
 require_relative "shared_examples/invalid_option"
 
diff --git a/Library/Homebrew/test/cask/cmd/home_spec.rb b/Library/Homebrew/test/cask/cmd/home_spec.rb
index be115715f..2462b7c4f 100644
--- a/Library/Homebrew/test/cask/cmd/home_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/home_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/invalid_option"
 
 describe Cask::Cmd::Home, :cask do
diff --git a/Library/Homebrew/test/cask/cmd/info_spec.rb b/Library/Homebrew/test/cask/cmd/info_spec.rb
index e2a73c103..2883ca239 100644
--- a/Library/Homebrew/test/cask/cmd/info_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/info_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/requires_cask_token"
 require_relative "shared_examples/invalid_option"
 
diff --git a/Library/Homebrew/test/cask/cmd/install_spec.rb b/Library/Homebrew/test/cask/cmd/install_spec.rb
index 1efe513b4..a5b0adbf7 100644
--- a/Library/Homebrew/test/cask/cmd/install_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/install_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/requires_cask_token"
 require_relative "shared_examples/invalid_option"
 
diff --git a/Library/Homebrew/test/cask/cmd/internal_stanza_spec.rb b/Library/Homebrew/test/cask/cmd/internal_stanza_spec.rb
index 5ea905673..a208adbfb 100644
--- a/Library/Homebrew/test/cask/cmd/internal_stanza_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/internal_stanza_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Cmd::InternalStanza, :cask do
   it "shows stanza of the Specified Cask" do
     command = described_class.new("homepage", "local-caffeine")
diff --git a/Library/Homebrew/test/cask/cmd/list_spec.rb b/Library/Homebrew/test/cask/cmd/list_spec.rb
index 7d63076e4..bc285acb7 100644
--- a/Library/Homebrew/test/cask/cmd/list_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/list_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/invalid_option"
 
 describe Cask::Cmd::List, :cask do
diff --git a/Library/Homebrew/test/cask/cmd/options_spec.rb b/Library/Homebrew/test/cask/cmd/options_spec.rb
index 0f254573f..3c95f4bf3 100644
--- a/Library/Homebrew/test/cask/cmd/options_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/options_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Cmd, :cask do
   it "supports setting the appdir" do
     described_class.new.process_options("help", "--appdir=/some/path/foo")
diff --git a/Library/Homebrew/test/cask/cmd/outdated_spec.rb b/Library/Homebrew/test/cask/cmd/outdated_spec.rb
index 23f204462..57763d1de 100644
--- a/Library/Homebrew/test/cask/cmd/outdated_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/outdated_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/invalid_option"
 
 describe Cask::Cmd::Outdated, :cask do
diff --git a/Library/Homebrew/test/cask/cmd/reinstall_spec.rb b/Library/Homebrew/test/cask/cmd/reinstall_spec.rb
index e011e35b6..dfc16d21f 100644
--- a/Library/Homebrew/test/cask/cmd/reinstall_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/reinstall_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/invalid_option"
 
 describe Cask::Cmd::Reinstall, :cask do
diff --git a/Library/Homebrew/test/cask/cmd/shared_examples/invalid_option.rb b/Library/Homebrew/test/cask/cmd/shared_examples/invalid_option.rb
index 12a05be92..467a1be08 100644
--- a/Library/Homebrew/test/cask/cmd/shared_examples/invalid_option.rb
+++ b/Library/Homebrew/test/cask/cmd/shared_examples/invalid_option.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 shared_examples "a command that handles invalid options" do
   context "when an invalid option is specified" do
     it "raises an exception when no Cask is specified" do
diff --git a/Library/Homebrew/test/cask/cmd/shared_examples/requires_cask_token.rb b/Library/Homebrew/test/cask/cmd/shared_examples/requires_cask_token.rb
index 8361270fb..0e68acc85 100644
--- a/Library/Homebrew/test/cask/cmd/shared_examples/requires_cask_token.rb
+++ b/Library/Homebrew/test/cask/cmd/shared_examples/requires_cask_token.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 shared_examples "a command that requires a Cask token" do
   context "when no Cask is specified" do
     it "raises an exception " do
diff --git a/Library/Homebrew/test/cask/cmd/style_spec.rb b/Library/Homebrew/test/cask/cmd/style_spec.rb
index 336fa1140..7e49ab330 100644
--- a/Library/Homebrew/test/cask/cmd/style_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/style_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "open3"
 require "rubygems"
 
diff --git a/Library/Homebrew/test/cask/cmd/uninstall_spec.rb b/Library/Homebrew/test/cask/cmd/uninstall_spec.rb
index dc6a07e01..a29977447 100644
--- a/Library/Homebrew/test/cask/cmd/uninstall_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/uninstall_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/requires_cask_token"
 require_relative "shared_examples/invalid_option"
 
diff --git a/Library/Homebrew/test/cask/cmd/upgrade_spec.rb b/Library/Homebrew/test/cask/cmd/upgrade_spec.rb
index 704c8ca3e..503778eb1 100644
--- a/Library/Homebrew/test/cask/cmd/upgrade_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/upgrade_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/invalid_option"
 
 describe Cask::Cmd::Upgrade, :cask do
diff --git a/Library/Homebrew/test/cask/cmd/zap_spec.rb b/Library/Homebrew/test/cask/cmd/zap_spec.rb
index fd646477e..66d90c58a 100644
--- a/Library/Homebrew/test/cask/cmd/zap_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/zap_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples/requires_cask_token"
 require_relative "shared_examples/invalid_option"
 
diff --git a/Library/Homebrew/test/cask/cmd_spec.rb b/Library/Homebrew/test/cask/cmd_spec.rb
index ee2a68fd4..1674d0e6a 100644
--- a/Library/Homebrew/test/cask/cmd_spec.rb
+++ b/Library/Homebrew/test/cask/cmd_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Cmd, :cask do
   it "lists the taps for Casks that show up in two taps" do
     listing = described_class.nice_listing(%w[
diff --git a/Library/Homebrew/test/cask/config_spec.rb b/Library/Homebrew/test/cask/config_spec.rb
index f160104bb..f7cc6aebc 100644
--- a/Library/Homebrew/test/cask/config_spec.rb
+++ b/Library/Homebrew/test/cask/config_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Config, :cask do
   subject(:config) { described_class.new }
 
diff --git a/Library/Homebrew/test/cask/conflicts_with_spec.rb b/Library/Homebrew/test/cask/conflicts_with_spec.rb
index 5a8a67633..059685af3 100644
--- a/Library/Homebrew/test/cask/conflicts_with_spec.rb
+++ b/Library/Homebrew/test/cask/conflicts_with_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe "conflicts_with", :cask do
   describe "conflicts_with cask" do
     let(:local_caffeine) {
diff --git a/Library/Homebrew/test/cask/depends_on_spec.rb b/Library/Homebrew/test/cask/depends_on_spec.rb
index 235c446e2..f8d679e6e 100644
--- a/Library/Homebrew/test/cask/depends_on_spec.rb
+++ b/Library/Homebrew/test/cask/depends_on_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # TODO: this test should be named after the corresponding class, once
 #       that class is abstracted from installer.rb
 describe "Satisfy Dependencies and Requirements", :cask do
diff --git a/Library/Homebrew/test/cask/dsl/appcast_spec.rb b/Library/Homebrew/test/cask/dsl/appcast_spec.rb
index 437d72e56..a3b1cf671 100644
--- a/Library/Homebrew/test/cask/dsl/appcast_spec.rb
+++ b/Library/Homebrew/test/cask/dsl/appcast_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/cask"
 
 describe Cask::DSL::Appcast do
diff --git a/Library/Homebrew/test/cask/dsl/caveats_spec.rb b/Library/Homebrew/test/cask/dsl/caveats_spec.rb
index f44e6ab7c..8c7af8955 100644
--- a/Library/Homebrew/test/cask/dsl/caveats_spec.rb
+++ b/Library/Homebrew/test/cask/dsl/caveats_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "test/cask/dsl/shared_examples/base"
 
 describe Cask::DSL::Caveats, :cask do
diff --git a/Library/Homebrew/test/cask/dsl/postflight_spec.rb b/Library/Homebrew/test/cask/dsl/postflight_spec.rb
index 46479b55b..2c0ea9a01 100644
--- a/Library/Homebrew/test/cask/dsl/postflight_spec.rb
+++ b/Library/Homebrew/test/cask/dsl/postflight_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "test/cask/dsl/shared_examples/base"
 require "test/cask/dsl/shared_examples/staged"
 
diff --git a/Library/Homebrew/test/cask/dsl/preflight_spec.rb b/Library/Homebrew/test/cask/dsl/preflight_spec.rb
index 2bcf1f665..1bf38464a 100644
--- a/Library/Homebrew/test/cask/dsl/preflight_spec.rb
+++ b/Library/Homebrew/test/cask/dsl/preflight_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "test/cask/dsl/shared_examples/base"
 require "test/cask/dsl/shared_examples/staged"
 
diff --git a/Library/Homebrew/test/cask/dsl/shared_examples/base.rb b/Library/Homebrew/test/cask/dsl/shared_examples/base.rb
index ccb425dd7..c46715d51 100644
--- a/Library/Homebrew/test/cask/dsl/shared_examples/base.rb
+++ b/Library/Homebrew/test/cask/dsl/shared_examples/base.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/dsl/base"
 
 shared_examples Cask::DSL::Base do
diff --git a/Library/Homebrew/test/cask/dsl/shared_examples/staged.rb b/Library/Homebrew/test/cask/dsl/shared_examples/staged.rb
index 78e6ae599..a4d29f84c 100644
--- a/Library/Homebrew/test/cask/dsl/shared_examples/staged.rb
+++ b/Library/Homebrew/test/cask/dsl/shared_examples/staged.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/staged"
 
 shared_examples Cask::Staged do
diff --git a/Library/Homebrew/test/cask/dsl/uninstall_postflight_spec.rb b/Library/Homebrew/test/cask/dsl/uninstall_postflight_spec.rb
index 14f02d4eb..846cd9055 100644
--- a/Library/Homebrew/test/cask/dsl/uninstall_postflight_spec.rb
+++ b/Library/Homebrew/test/cask/dsl/uninstall_postflight_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "test/cask/dsl/shared_examples/base"
 
 describe Cask::DSL::UninstallPostflight, :cask do
diff --git a/Library/Homebrew/test/cask/dsl/uninstall_preflight_spec.rb b/Library/Homebrew/test/cask/dsl/uninstall_preflight_spec.rb
index 9e8db707a..f32679dd0 100644
--- a/Library/Homebrew/test/cask/dsl/uninstall_preflight_spec.rb
+++ b/Library/Homebrew/test/cask/dsl/uninstall_preflight_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "test/cask/dsl/shared_examples/base"
 require "test/cask/dsl/shared_examples/staged"
 
diff --git a/Library/Homebrew/test/cask/dsl/version_spec.rb b/Library/Homebrew/test/cask/dsl/version_spec.rb
index ace2e0937..55271f0dd 100644
--- a/Library/Homebrew/test/cask/dsl/version_spec.rb
+++ b/Library/Homebrew/test/cask/dsl/version_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::DSL::Version, :cask do
   shared_examples "expectations hash" do |input_name, expectations|
     expectations.each do |input_value, expected_output|
diff --git a/Library/Homebrew/test/cask/dsl_spec.rb b/Library/Homebrew/test/cask/dsl_spec.rb
index d26f237e2..3e1de25e8 100644
--- a/Library/Homebrew/test/cask/dsl_spec.rb
+++ b/Library/Homebrew/test/cask/dsl_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::DSL, :cask do
   let(:cask) { Cask::CaskLoader.load(cask_path(token.to_s)) }
   let(:token) { "basic-cask" }
diff --git a/Library/Homebrew/test/cask/installer_spec.rb b/Library/Homebrew/test/cask/installer_spec.rb
index 4d2bad775..1c77e811a 100644
--- a/Library/Homebrew/test/cask/installer_spec.rb
+++ b/Library/Homebrew/test/cask/installer_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Installer, :cask do
   describe "install" do
     let(:empty_depends_on_stub) {
diff --git a/Library/Homebrew/test/cask/macos_spec.rb b/Library/Homebrew/test/cask/macos_spec.rb
index 2e385acd5..830f5d453 100644
--- a/Library/Homebrew/test/cask/macos_spec.rb
+++ b/Library/Homebrew/test/cask/macos_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe MacOS, :cask do
   it "says '/' is undeletable" do
     expect(MacOS).to be_undeletable(
diff --git a/Library/Homebrew/test/cask/pkg_spec.rb b/Library/Homebrew/test/cask/pkg_spec.rb
index e64de0d9f..f3eccc97c 100644
--- a/Library/Homebrew/test/cask/pkg_spec.rb
+++ b/Library/Homebrew/test/cask/pkg_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Pkg, :cask do
   describe "#uninstall" do
     let(:fake_system_command) { NeverSudoSystemCommand }
diff --git a/Library/Homebrew/test/cask/quarantine_spec.rb b/Library/Homebrew/test/cask/quarantine_spec.rb
index c46706b00..684587bbd 100644
--- a/Library/Homebrew/test/cask/quarantine_spec.rb
+++ b/Library/Homebrew/test/cask/quarantine_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Cask::Quarantine, :cask do
   matcher :be_quarantined do
     match do |path|
diff --git a/Library/Homebrew/test/cask/verify_spec.rb b/Library/Homebrew/test/cask/verify_spec.rb
index e5589c4b5..f48f0c5d6 100644
--- a/Library/Homebrew/test/cask/verify_spec.rb
+++ b/Library/Homebrew/test/cask/verify_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Cask
   describe Verify, :cask do
     describe "::all" do
diff --git a/Library/Homebrew/test/caveats_spec.rb b/Library/Homebrew/test/caveats_spec.rb
index ad260aebe..ff010ff16 100644
--- a/Library/Homebrew/test/caveats_spec.rb
+++ b/Library/Homebrew/test/caveats_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "caveats"
 
diff --git a/Library/Homebrew/test/checksum_spec.rb b/Library/Homebrew/test/checksum_spec.rb
index 89658c483..7dc894581 100644
--- a/Library/Homebrew/test/checksum_spec.rb
+++ b/Library/Homebrew/test/checksum_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "checksum"
 
 describe Checksum do
diff --git a/Library/Homebrew/test/checksum_verification_spec.rb b/Library/Homebrew/test/checksum_verification_spec.rb
index 247f08688..7f3109ca4 100644
--- a/Library/Homebrew/test/checksum_verification_spec.rb
+++ b/Library/Homebrew/test/checksum_verification_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 
 describe Formula do
diff --git a/Library/Homebrew/test/cleaner_spec.rb b/Library/Homebrew/test/cleaner_spec.rb
index 62e4c3662..bba23b7b8 100644
--- a/Library/Homebrew/test/cleaner_spec.rb
+++ b/Library/Homebrew/test/cleaner_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cleaner"
 require "formula"
 
diff --git a/Library/Homebrew/test/cleanup_spec.rb b/Library/Homebrew/test/cleanup_spec.rb
index 9b3df12c8..ce6a0f21f 100644
--- a/Library/Homebrew/test/cleanup_spec.rb
+++ b/Library/Homebrew/test/cleanup_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "test/support/fixtures/testball"
 require "cleanup"
 require "cask/cache"
diff --git a/Library/Homebrew/test/cli/parser_spec.rb b/Library/Homebrew/test/cli/parser_spec.rb
index fd911574a..a0cfa8c5c 100644
--- a/Library/Homebrew/test/cli/parser_spec.rb
+++ b/Library/Homebrew/test/cli/parser_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "../../cli/parser"
 
 describe Homebrew::CLI::Parser do
diff --git a/Library/Homebrew/test/cmd/--cache_spec.rb b/Library/Homebrew/test/cmd/--cache_spec.rb
index 143f2e6e6..d68256530 100644
--- a/Library/Homebrew/test/cmd/--cache_spec.rb
+++ b/Library/Homebrew/test/cmd/--cache_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.__cache_args" do
diff --git a/Library/Homebrew/test/cmd/--cellar_spec.rb b/Library/Homebrew/test/cmd/--cellar_spec.rb
index fdfeb6b39..5919a2f6a 100644
--- a/Library/Homebrew/test/cmd/--cellar_spec.rb
+++ b/Library/Homebrew/test/cmd/--cellar_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.__cellar_args" do
diff --git a/Library/Homebrew/test/cmd/--env_spec.rb b/Library/Homebrew/test/cmd/--env_spec.rb
index 270e602f7..2f94f1310 100644
--- a/Library/Homebrew/test/cmd/--env_spec.rb
+++ b/Library/Homebrew/test/cmd/--env_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.__env_args" do
diff --git a/Library/Homebrew/test/cmd/--prefix_spec.rb b/Library/Homebrew/test/cmd/--prefix_spec.rb
index 5aec23865..51c34fe22 100644
--- a/Library/Homebrew/test/cmd/--prefix_spec.rb
+++ b/Library/Homebrew/test/cmd/--prefix_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.__prefix_args" do
diff --git a/Library/Homebrew/test/cmd/--repository_spec.rb b/Library/Homebrew/test/cmd/--repository_spec.rb
index 6e56a114d..a6d351d90 100644
--- a/Library/Homebrew/test/cmd/--repository_spec.rb
+++ b/Library/Homebrew/test/cmd/--repository_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.__repository_args" do
diff --git a/Library/Homebrew/test/cmd/--version_spec.rb b/Library/Homebrew/test/cmd/--version_spec.rb
index 2fcd6b0b6..3650b7d44 100644
--- a/Library/Homebrew/test/cmd/--version_spec.rb
+++ b/Library/Homebrew/test/cmd/--version_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.__version_args" do
diff --git a/Library/Homebrew/test/cmd/analytics_spec.rb b/Library/Homebrew/test/cmd/analytics_spec.rb
index 7671bdf93..82545513b 100644
--- a/Library/Homebrew/test/cmd/analytics_spec.rb
+++ b/Library/Homebrew/test/cmd/analytics_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.analytics_args" do
diff --git a/Library/Homebrew/test/cmd/bundle_spec.rb b/Library/Homebrew/test/cmd/bundle_spec.rb
index c2434254e..61d7fb225 100644
--- a/Library/Homebrew/test/cmd/bundle_spec.rb
+++ b/Library/Homebrew/test/cmd/bundle_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe "brew bundle", :integration_test, :needs_test_cmd_taps do
   describe "check" do
     it "checks if a Brewfile's dependencies are satisfied", :needs_network do
diff --git a/Library/Homebrew/test/cmd/cask_spec.rb b/Library/Homebrew/test/cmd/cask_spec.rb
index 0bc178cc5..675ac09e9 100644
--- a/Library/Homebrew/test/cmd/cask_spec.rb
+++ b/Library/Homebrew/test/cmd/cask_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe "brew cask", :integration_test, :needs_macos, :needs_network do
   describe "list" do
     it "returns a list of installed Casks" do
diff --git a/Library/Homebrew/test/cmd/cat_spec.rb b/Library/Homebrew/test/cmd/cat_spec.rb
index a79878eb9..2a9132e76 100644
--- a/Library/Homebrew/test/cmd/cat_spec.rb
+++ b/Library/Homebrew/test/cmd/cat_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.cat_args" do
diff --git a/Library/Homebrew/test/cmd/cleanup_spec.rb b/Library/Homebrew/test/cmd/cleanup_spec.rb
index 9a5f53b27..a822752c3 100644
--- a/Library/Homebrew/test/cmd/cleanup_spec.rb
+++ b/Library/Homebrew/test/cmd/cleanup_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.cleanup_args" do
diff --git a/Library/Homebrew/test/cmd/command_spec.rb b/Library/Homebrew/test/cmd/command_spec.rb
index 83122f247..1d71661f2 100644
--- a/Library/Homebrew/test/cmd/command_spec.rb
+++ b/Library/Homebrew/test/cmd/command_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.command_args" do
diff --git a/Library/Homebrew/test/cmd/commands_spec.rb b/Library/Homebrew/test/cmd/commands_spec.rb
index 6c0ab0b67..7091a345e 100644
--- a/Library/Homebrew/test/cmd/commands_spec.rb
+++ b/Library/Homebrew/test/cmd/commands_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/command"
 require "cmd/commands"
 require "fileutils"
diff --git a/Library/Homebrew/test/cmd/config_spec.rb b/Library/Homebrew/test/cmd/config_spec.rb
index c92a71c4b..2c454e14d 100644
--- a/Library/Homebrew/test/cmd/config_spec.rb
+++ b/Library/Homebrew/test/cmd/config_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.config_args" do
diff --git a/Library/Homebrew/test/cmd/custom-external-command_spec.rb b/Library/Homebrew/test/cmd/custom-external-command_spec.rb
index 7a4e6501d..b6aedd83e 100644
--- a/Library/Homebrew/test/cmd/custom-external-command_spec.rb
+++ b/Library/Homebrew/test/cmd/custom-external-command_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe "brew custom-external-command", :integration_test do
   it "is supported" do
     mktmpdir do |path|
diff --git a/Library/Homebrew/test/cmd/deps_spec.rb b/Library/Homebrew/test/cmd/deps_spec.rb
index 50a30c5e1..8ec40bffb 100644
--- a/Library/Homebrew/test/cmd/deps_spec.rb
+++ b/Library/Homebrew/test/cmd/deps_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe "brew deps", :integration_test do
   it "outputs all of a Formula's dependencies and their dependencies on separate lines" do
     setup_test_formula "foo"
diff --git a/Library/Homebrew/test/cmd/desc_spec.rb b/Library/Homebrew/test/cmd/desc_spec.rb
index c820faa8d..356484226 100644
--- a/Library/Homebrew/test/cmd/desc_spec.rb
+++ b/Library/Homebrew/test/cmd/desc_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.desc_args" do
diff --git a/Library/Homebrew/test/cmd/diy_spec.rb b/Library/Homebrew/test/cmd/diy_spec.rb
index 914cd3f40..5168cf552 100644
--- a/Library/Homebrew/test/cmd/diy_spec.rb
+++ b/Library/Homebrew/test/cmd/diy_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.diy_args" do
diff --git a/Library/Homebrew/test/cmd/doctor_spec.rb b/Library/Homebrew/test/cmd/doctor_spec.rb
index 4e3803232..eea6caab7 100644
--- a/Library/Homebrew/test/cmd/doctor_spec.rb
+++ b/Library/Homebrew/test/cmd/doctor_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.doctor_args" do
diff --git a/Library/Homebrew/test/cmd/fetch_spec.rb b/Library/Homebrew/test/cmd/fetch_spec.rb
index 599360dc3..a49cbfd8e 100644
--- a/Library/Homebrew/test/cmd/fetch_spec.rb
+++ b/Library/Homebrew/test/cmd/fetch_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.fetch_args" do
diff --git a/Library/Homebrew/test/cmd/gist-logs_spec.rb b/Library/Homebrew/test/cmd/gist-logs_spec.rb
index 848780f70..490373c7d 100644
--- a/Library/Homebrew/test/cmd/gist-logs_spec.rb
+++ b/Library/Homebrew/test/cmd/gist-logs_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.gist_logs_args" do
diff --git a/Library/Homebrew/test/cmd/help_spec.rb b/Library/Homebrew/test/cmd/help_spec.rb
index 04b7d53c1..b94d8a7ef 100644
--- a/Library/Homebrew/test/cmd/help_spec.rb
+++ b/Library/Homebrew/test/cmd/help_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe "brew", :integration_test do
   describe "help" do
     it "prints help for a documented Ruby command" do
diff --git a/Library/Homebrew/test/cmd/home_spec.rb b/Library/Homebrew/test/cmd/home_spec.rb
index 421fcdf9b..15aee21eb 100644
--- a/Library/Homebrew/test/cmd/home_spec.rb
+++ b/Library/Homebrew/test/cmd/home_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.home_args" do
diff --git a/Library/Homebrew/test/cmd/info_spec.rb b/Library/Homebrew/test/cmd/info_spec.rb
index 35901269c..acb131e83 100644
--- a/Library/Homebrew/test/cmd/info_spec.rb
+++ b/Library/Homebrew/test/cmd/info_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/info"
 
 require "cmd/shared_examples/args_parse"
diff --git a/Library/Homebrew/test/cmd/install_spec.rb b/Library/Homebrew/test/cmd/install_spec.rb
index 217dba502..0bc91c86c 100644
--- a/Library/Homebrew/test/cmd/install_spec.rb
+++ b/Library/Homebrew/test/cmd/install_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.install_args" do
diff --git a/Library/Homebrew/test/cmd/leaves_spec.rb b/Library/Homebrew/test/cmd/leaves_spec.rb
index ea6960641..ee56b3cbe 100644
--- a/Library/Homebrew/test/cmd/leaves_spec.rb
+++ b/Library/Homebrew/test/cmd/leaves_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.leaves_args" do
diff --git a/Library/Homebrew/test/cmd/link_spec.rb b/Library/Homebrew/test/cmd/link_spec.rb
index 8460e05e2..f76b5a1d8 100644
--- a/Library/Homebrew/test/cmd/link_spec.rb
+++ b/Library/Homebrew/test/cmd/link_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.link_args" do
diff --git a/Library/Homebrew/test/cmd/list_spec.rb b/Library/Homebrew/test/cmd/list_spec.rb
index c04c5890e..e12a8522d 100644
--- a/Library/Homebrew/test/cmd/list_spec.rb
+++ b/Library/Homebrew/test/cmd/list_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.list_args" do
diff --git a/Library/Homebrew/test/cmd/log_spec.rb b/Library/Homebrew/test/cmd/log_spec.rb
index 31d91607b..7ed48a2d1 100644
--- a/Library/Homebrew/test/cmd/log_spec.rb
+++ b/Library/Homebrew/test/cmd/log_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.log_args" do
diff --git a/Library/Homebrew/test/cmd/migrate_spec.rb b/Library/Homebrew/test/cmd/migrate_spec.rb
index a983d9e19..8c8faee07 100644
--- a/Library/Homebrew/test/cmd/migrate_spec.rb
+++ b/Library/Homebrew/test/cmd/migrate_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.migrate_args" do
diff --git a/Library/Homebrew/test/cmd/missing_spec.rb b/Library/Homebrew/test/cmd/missing_spec.rb
index 180df1b12..8f5a3382f 100644
--- a/Library/Homebrew/test/cmd/missing_spec.rb
+++ b/Library/Homebrew/test/cmd/missing_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.missing_args" do
diff --git a/Library/Homebrew/test/cmd/options_spec.rb b/Library/Homebrew/test/cmd/options_spec.rb
index 3a50bab97..655c3fa0e 100644
--- a/Library/Homebrew/test/cmd/options_spec.rb
+++ b/Library/Homebrew/test/cmd/options_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.options_args" do
diff --git a/Library/Homebrew/test/cmd/outdated_spec.rb b/Library/Homebrew/test/cmd/outdated_spec.rb
index 73f41e039..54a659328 100644
--- a/Library/Homebrew/test/cmd/outdated_spec.rb
+++ b/Library/Homebrew/test/cmd/outdated_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.outdated_args" do
diff --git a/Library/Homebrew/test/cmd/pin_spec.rb b/Library/Homebrew/test/cmd/pin_spec.rb
index cc1387428..a34a3e21c 100644
--- a/Library/Homebrew/test/cmd/pin_spec.rb
+++ b/Library/Homebrew/test/cmd/pin_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.pin_args" do
diff --git a/Library/Homebrew/test/cmd/postinstall_spec.rb b/Library/Homebrew/test/cmd/postinstall_spec.rb
index cf6cd213f..ed676f558 100644
--- a/Library/Homebrew/test/cmd/postinstall_spec.rb
+++ b/Library/Homebrew/test/cmd/postinstall_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.postinstall_args" do
diff --git a/Library/Homebrew/test/cmd/readall_spec.rb b/Library/Homebrew/test/cmd/readall_spec.rb
index 23772a937..03f3b2ae5 100644
--- a/Library/Homebrew/test/cmd/readall_spec.rb
+++ b/Library/Homebrew/test/cmd/readall_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.readall_args" do
diff --git a/Library/Homebrew/test/cmd/reinstall_spec.rb b/Library/Homebrew/test/cmd/reinstall_spec.rb
index d2361e93a..45b5a48ff 100644
--- a/Library/Homebrew/test/cmd/reinstall_spec.rb
+++ b/Library/Homebrew/test/cmd/reinstall_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "extend/ENV"
 require "cmd/shared_examples/args_parse"
 
diff --git a/Library/Homebrew/test/cmd/search_spec.rb b/Library/Homebrew/test/cmd/search_spec.rb
index c6e4f3361..40932a5c4 100644
--- a/Library/Homebrew/test/cmd/search_spec.rb
+++ b/Library/Homebrew/test/cmd/search_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/search"
 require "cmd/shared_examples/args_parse"
 
diff --git a/Library/Homebrew/test/cmd/services_spec.rb b/Library/Homebrew/test/cmd/services_spec.rb
index 669e84e5f..decee40fa 100644
--- a/Library/Homebrew/test/cmd/services_spec.rb
+++ b/Library/Homebrew/test/cmd/services_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe "brew services", :integration_test, :needs_macos, :needs_network do
   it "allows controlling services" do
     setup_remote_tap "homebrew/services"
diff --git a/Library/Homebrew/test/cmd/sh_spec.rb b/Library/Homebrew/test/cmd/sh_spec.rb
index 97bf92ce1..52000a549 100644
--- a/Library/Homebrew/test/cmd/sh_spec.rb
+++ b/Library/Homebrew/test/cmd/sh_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.sh_args" do
diff --git a/Library/Homebrew/test/cmd/shared_examples/args_parse.rb b/Library/Homebrew/test/cmd/shared_examples/args_parse.rb
index b95b5eb9b..6230b9e43 100644
--- a/Library/Homebrew/test/cmd/shared_examples/args_parse.rb
+++ b/Library/Homebrew/test/cmd/shared_examples/args_parse.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 shared_examples "parseable arguments" do
   subject(:method_name) do |example|
     example.metadata[:example_group][:parent_example_group][:description]
diff --git a/Library/Homebrew/test/cmd/style_spec.rb b/Library/Homebrew/test/cmd/style_spec.rb
index cd71be032..7e4289134 100644
--- a/Library/Homebrew/test/cmd/style_spec.rb
+++ b/Library/Homebrew/test/cmd/style_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/style"
 require "cmd/shared_examples/args_parse"
 
diff --git a/Library/Homebrew/test/cmd/switch_spec.rb b/Library/Homebrew/test/cmd/switch_spec.rb
index b7903256c..d50f993e4 100644
--- a/Library/Homebrew/test/cmd/switch_spec.rb
+++ b/Library/Homebrew/test/cmd/switch_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.switch_args" do
diff --git a/Library/Homebrew/test/cmd/tap-info_spec.rb b/Library/Homebrew/test/cmd/tap-info_spec.rb
index 61e493c1a..d03ca1784 100644
--- a/Library/Homebrew/test/cmd/tap-info_spec.rb
+++ b/Library/Homebrew/test/cmd/tap-info_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.tap_info_args" do
diff --git a/Library/Homebrew/test/cmd/tap_spec.rb b/Library/Homebrew/test/cmd/tap_spec.rb
index d635c903b..69f43ae84 100644
--- a/Library/Homebrew/test/cmd/tap_spec.rb
+++ b/Library/Homebrew/test/cmd/tap_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.tap_args" do
diff --git a/Library/Homebrew/test/cmd/uninstall_spec.rb b/Library/Homebrew/test/cmd/uninstall_spec.rb
index 6cc0510fe..696be790e 100644
--- a/Library/Homebrew/test/cmd/uninstall_spec.rb
+++ b/Library/Homebrew/test/cmd/uninstall_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/uninstall"
 
 require "cmd/shared_examples/args_parse"
diff --git a/Library/Homebrew/test/cmd/unlink_spec.rb b/Library/Homebrew/test/cmd/unlink_spec.rb
index 7d38c3741..148939316 100644
--- a/Library/Homebrew/test/cmd/unlink_spec.rb
+++ b/Library/Homebrew/test/cmd/unlink_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.unlink_args" do
diff --git a/Library/Homebrew/test/cmd/unpack_spec.rb b/Library/Homebrew/test/cmd/unpack_spec.rb
index 3ddeedb45..0a0c27eee 100644
--- a/Library/Homebrew/test/cmd/unpack_spec.rb
+++ b/Library/Homebrew/test/cmd/unpack_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.unpack_args" do
diff --git a/Library/Homebrew/test/cmd/unpin_spec.rb b/Library/Homebrew/test/cmd/unpin_spec.rb
index d5c4766fd..be3faa7c8 100644
--- a/Library/Homebrew/test/cmd/unpin_spec.rb
+++ b/Library/Homebrew/test/cmd/unpin_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.unpin_args" do
diff --git a/Library/Homebrew/test/cmd/untap_spec.rb b/Library/Homebrew/test/cmd/untap_spec.rb
index caef63c58..9e2568597 100644
--- a/Library/Homebrew/test/cmd/untap_spec.rb
+++ b/Library/Homebrew/test/cmd/untap_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.untap_args" do
diff --git a/Library/Homebrew/test/cmd/update-report_spec.rb b/Library/Homebrew/test/cmd/update-report_spec.rb
index 6442c19ff..d07353431 100644
--- a/Library/Homebrew/test/cmd/update-report_spec.rb
+++ b/Library/Homebrew/test/cmd/update-report_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/update-report"
 require "formula_versions"
 require "yaml"
diff --git a/Library/Homebrew/test/cmd/upgrade_spec.rb b/Library/Homebrew/test/cmd/upgrade_spec.rb
index 3bc325d1c..9f139fc05 100644
--- a/Library/Homebrew/test/cmd/upgrade_spec.rb
+++ b/Library/Homebrew/test/cmd/upgrade_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.upgrade_args" do
diff --git a/Library/Homebrew/test/cmd/uses_spec.rb b/Library/Homebrew/test/cmd/uses_spec.rb
index b09027392..8321777ba 100644
--- a/Library/Homebrew/test/cmd/uses_spec.rb
+++ b/Library/Homebrew/test/cmd/uses_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.uses_args" do
diff --git a/Library/Homebrew/test/compiler_failure_spec.rb b/Library/Homebrew/test/compiler_failure_spec.rb
index ee71c1f64..08763e33c 100644
--- a/Library/Homebrew/test/compiler_failure_spec.rb
+++ b/Library/Homebrew/test/compiler_failure_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "compilers"
 
 describe CompilerFailure do
diff --git a/Library/Homebrew/test/compiler_selector_spec.rb b/Library/Homebrew/test/compiler_selector_spec.rb
index 254fdefeb..f00c58add 100644
--- a/Library/Homebrew/test/compiler_selector_spec.rb
+++ b/Library/Homebrew/test/compiler_selector_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "compilers"
 require "software_spec"
 
diff --git a/Library/Homebrew/test/cxxstdlib_spec.rb b/Library/Homebrew/test/cxxstdlib_spec.rb
index ea1631a01..0cd0b2070 100644
--- a/Library/Homebrew/test/cxxstdlib_spec.rb
+++ b/Library/Homebrew/test/cxxstdlib_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "cxxstdlib"
 
diff --git a/Library/Homebrew/test/dependable_spec.rb b/Library/Homebrew/test/dependable_spec.rb
index 8ffc2506c..2beb3c457 100644
--- a/Library/Homebrew/test/dependable_spec.rb
+++ b/Library/Homebrew/test/dependable_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "dependable"
 
 describe Dependable do
diff --git a/Library/Homebrew/test/dependencies_spec.rb b/Library/Homebrew/test/dependencies_spec.rb
index ed86cb630..07da34497 100644
--- a/Library/Homebrew/test/dependencies_spec.rb
+++ b/Library/Homebrew/test/dependencies_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "dependencies"
 require "dependency"
 
diff --git a/Library/Homebrew/test/dependency_collector_spec.rb b/Library/Homebrew/test/dependency_collector_spec.rb
index b921286a9..d4af7885a 100644
--- a/Library/Homebrew/test/dependency_collector_spec.rb
+++ b/Library/Homebrew/test/dependency_collector_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "dependency_collector"
 
 describe DependencyCollector do
diff --git a/Library/Homebrew/test/dependency_expansion_spec.rb b/Library/Homebrew/test/dependency_expansion_spec.rb
index 16c37b931..c3a1c4b7e 100644
--- a/Library/Homebrew/test/dependency_expansion_spec.rb
+++ b/Library/Homebrew/test/dependency_expansion_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "dependency"
 
 describe Dependency do
diff --git a/Library/Homebrew/test/dependency_spec.rb b/Library/Homebrew/test/dependency_spec.rb
index bc2fa813b..ec772097e 100644
--- a/Library/Homebrew/test/dependency_spec.rb
+++ b/Library/Homebrew/test/dependency_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "dependency"
 
 describe Dependency do
diff --git a/Library/Homebrew/test/description_cache_store_spec.rb b/Library/Homebrew/test/description_cache_store_spec.rb
index d4aa1aa13..a5855a9ce 100644
--- a/Library/Homebrew/test/description_cache_store_spec.rb
+++ b/Library/Homebrew/test/description_cache_store_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "description_cache_store"
 
 describe DescriptionCacheStore do
diff --git a/Library/Homebrew/test/descriptions_spec.rb b/Library/Homebrew/test/descriptions_spec.rb
index 9fe327fd0..01aa00434 100644
--- a/Library/Homebrew/test/descriptions_spec.rb
+++ b/Library/Homebrew/test/descriptions_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "descriptions"
 
 describe Descriptions do
diff --git a/Library/Homebrew/test/dev-cmd/audit_spec.rb b/Library/Homebrew/test/dev-cmd/audit_spec.rb
index c8fd7b000..246749f96 100644
--- a/Library/Homebrew/test/dev-cmd/audit_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/audit_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "dev-cmd/audit"
 require "formulary"
 require "cmd/shared_examples/args_parse"
diff --git a/Library/Homebrew/test/dev-cmd/bottle_spec.rb b/Library/Homebrew/test/dev-cmd/bottle_spec.rb
index 4180796ea..1acbf4480 100644
--- a/Library/Homebrew/test/dev-cmd/bottle_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/bottle_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.bottle_args" do
diff --git a/Library/Homebrew/test/dev-cmd/bump-formula-pr_spec.rb b/Library/Homebrew/test/dev-cmd/bump-formula-pr_spec.rb
index 1ca0a2e5b..9cdc95f9a 100644
--- a/Library/Homebrew/test/dev-cmd/bump-formula-pr_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/bump-formula-pr_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.bump_formula_pr_args" do
diff --git a/Library/Homebrew/test/dev-cmd/create_spec.rb b/Library/Homebrew/test/dev-cmd/create_spec.rb
index 37d119c03..e4e98c207 100644
--- a/Library/Homebrew/test/dev-cmd/create_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/create_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.create_args" do
diff --git a/Library/Homebrew/test/dev-cmd/edit_spec.rb b/Library/Homebrew/test/dev-cmd/edit_spec.rb
index da9f7af21..df88019fa 100644
--- a/Library/Homebrew/test/dev-cmd/edit_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/edit_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.edit_args" do
diff --git a/Library/Homebrew/test/dev-cmd/extract_spec.rb b/Library/Homebrew/test/dev-cmd/extract_spec.rb
index abff3d6d2..169f07807 100644
--- a/Library/Homebrew/test/dev-cmd/extract_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/extract_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.extract_args" do
diff --git a/Library/Homebrew/test/dev-cmd/formula_spec.rb b/Library/Homebrew/test/dev-cmd/formula_spec.rb
index f64817194..d9e96bc7b 100644
--- a/Library/Homebrew/test/dev-cmd/formula_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/formula_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.formula_args" do
diff --git a/Library/Homebrew/test/dev-cmd/irb_spec.rb b/Library/Homebrew/test/dev-cmd/irb_spec.rb
index 291bdc161..666374c87 100644
--- a/Library/Homebrew/test/dev-cmd/irb_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/irb_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.irb_args" do
diff --git a/Library/Homebrew/test/dev-cmd/linkage_spec.rb b/Library/Homebrew/test/dev-cmd/linkage_spec.rb
index 7a0ffa598..f083b5cb6 100644
--- a/Library/Homebrew/test/dev-cmd/linkage_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/linkage_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.linkage_args" do
diff --git a/Library/Homebrew/test/dev-cmd/man_spec.rb b/Library/Homebrew/test/dev-cmd/man_spec.rb
index 5cb905678..07eab3a25 100644
--- a/Library/Homebrew/test/dev-cmd/man_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/man_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.man_args" do
diff --git a/Library/Homebrew/test/dev-cmd/mirror_spec.rb b/Library/Homebrew/test/dev-cmd/mirror_spec.rb
index 2c11572bf..4ad0dc02a 100644
--- a/Library/Homebrew/test/dev-cmd/mirror_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/mirror_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.mirror_args" do
diff --git a/Library/Homebrew/test/dev-cmd/prof_spec.rb b/Library/Homebrew/test/dev-cmd/prof_spec.rb
index a3c39b5c5..c2dc0b3d4 100644
--- a/Library/Homebrew/test/dev-cmd/prof_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/prof_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.prof_args" do
diff --git a/Library/Homebrew/test/dev-cmd/pull_spec.rb b/Library/Homebrew/test/dev-cmd/pull_spec.rb
index aaf11e71f..926b660bc 100644
--- a/Library/Homebrew/test/dev-cmd/pull_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/pull_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.pull_args" do
diff --git a/Library/Homebrew/test/dev-cmd/release-notes_spec.rb b/Library/Homebrew/test/dev-cmd/release-notes_spec.rb
index 973e2b0aa..bbe9bff87 100644
--- a/Library/Homebrew/test/dev-cmd/release-notes_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/release-notes_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.release_notes_args" do
diff --git a/Library/Homebrew/test/dev-cmd/ruby_spec.rb b/Library/Homebrew/test/dev-cmd/ruby_spec.rb
index 0f65d6888..42bb98c1f 100644
--- a/Library/Homebrew/test/dev-cmd/ruby_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/ruby_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.ruby_args" do
diff --git a/Library/Homebrew/test/dev-cmd/tap-new_spec.rb b/Library/Homebrew/test/dev-cmd/tap-new_spec.rb
index 868650c7a..316637c04 100644
--- a/Library/Homebrew/test/dev-cmd/tap-new_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/tap-new_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.tap_new_args" do
diff --git a/Library/Homebrew/test/dev-cmd/test_spec.rb b/Library/Homebrew/test/dev-cmd/test_spec.rb
index 8d6bb479c..26f45c421 100644
--- a/Library/Homebrew/test/dev-cmd/test_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/test_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.test_args" do
diff --git a/Library/Homebrew/test/dev-cmd/vendor-gems_spec.rb b/Library/Homebrew/test/dev-cmd/vendor-gems_spec.rb
index 3d7531339..ac08d2947 100644
--- a/Library/Homebrew/test/dev-cmd/vendor-gems_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/vendor-gems_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cmd/shared_examples/args_parse"
 
 describe "Homebrew.vendor_gems_args" do
diff --git a/Library/Homebrew/test/diagnostic_checks_spec.rb b/Library/Homebrew/test/diagnostic_checks_spec.rb
index 76ce1222d..8d75726c5 100644
--- a/Library/Homebrew/test/diagnostic_checks_spec.rb
+++ b/Library/Homebrew/test/diagnostic_checks_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "diagnostic"
 
 describe Homebrew::Diagnostic::Checks do
diff --git a/Library/Homebrew/test/download_strategies_spec.rb b/Library/Homebrew/test/download_strategies_spec.rb
index 21df40c50..615daa05f 100644
--- a/Library/Homebrew/test/download_strategies_spec.rb
+++ b/Library/Homebrew/test/download_strategies_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "download_strategy"
 
 describe AbstractDownloadStrategy do
diff --git a/Library/Homebrew/test/emoji_spec.rb b/Library/Homebrew/test/emoji_spec.rb
index f2aec7ad2..4343c37d1 100644
--- a/Library/Homebrew/test/emoji_spec.rb
+++ b/Library/Homebrew/test/emoji_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "emoji"
 
 describe Emoji do
diff --git a/Library/Homebrew/test/error_during_execution_spec.rb b/Library/Homebrew/test/error_during_execution_spec.rb
index bd3b96e6c..513ff7a50 100644
--- a/Library/Homebrew/test/error_during_execution_spec.rb
+++ b/Library/Homebrew/test/error_during_execution_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe ErrorDuringExecution do
   subject(:error) { described_class.new(command, status: status, output: output) }
 
diff --git a/Library/Homebrew/test/exceptions_spec.rb b/Library/Homebrew/test/exceptions_spec.rb
index 934a651d9..63bc8410b 100644
--- a/Library/Homebrew/test/exceptions_spec.rb
+++ b/Library/Homebrew/test/exceptions_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "exceptions"
 
 describe MultipleVersionsInstalledError do
diff --git a/Library/Homebrew/test/formatter_spec.rb b/Library/Homebrew/test/formatter_spec.rb
index 168b80ba8..fb348213a 100644
--- a/Library/Homebrew/test/formatter_spec.rb
+++ b/Library/Homebrew/test/formatter_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/formatter"
 require "utils/tty"
 
diff --git a/Library/Homebrew/test/formula_installer_bottle_spec.rb b/Library/Homebrew/test/formula_installer_bottle_spec.rb
index 30d19ca3f..3560cc7f9 100644
--- a/Library/Homebrew/test/formula_installer_bottle_spec.rb
+++ b/Library/Homebrew/test/formula_installer_bottle_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "formula_installer"
 require "keg"
diff --git a/Library/Homebrew/test/formula_installer_spec.rb b/Library/Homebrew/test/formula_installer_spec.rb
index dc4dc9117..682a665a5 100644
--- a/Library/Homebrew/test/formula_installer_spec.rb
+++ b/Library/Homebrew/test/formula_installer_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "formula_installer"
 require "keg"
diff --git a/Library/Homebrew/test/formula_pin_spec.rb b/Library/Homebrew/test/formula_pin_spec.rb
index b06c5eff9..03e83da67 100644
--- a/Library/Homebrew/test/formula_pin_spec.rb
+++ b/Library/Homebrew/test/formula_pin_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula_pin"
 
 describe FormulaPin do
diff --git a/Library/Homebrew/test/formula_spec.rb b/Library/Homebrew/test/formula_spec.rb
index f51548aaa..b76211595 100644
--- a/Library/Homebrew/test/formula_spec.rb
+++ b/Library/Homebrew/test/formula_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "test/support/fixtures/testball"
 require "formula"
 
@@ -380,7 +382,7 @@ describe Formula do
 
       stamps_with_revisions.each do |stamp, revision|
         version = "HEAD-#{stamp}"
-        version << "_#{revision}" unless revision.zero?
+        version = "#{version}_#{revision}" unless revision.zero?
 
         prefix = f.rack/version
         prefix.mkpath
diff --git a/Library/Homebrew/test/formula_spec_selection_spec.rb b/Library/Homebrew/test/formula_spec_selection_spec.rb
index 20231ffda..98fb36171 100644
--- a/Library/Homebrew/test/formula_spec_selection_spec.rb
+++ b/Library/Homebrew/test/formula_spec_selection_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 
 describe Formula do
diff --git a/Library/Homebrew/test/formula_support_spec.rb b/Library/Homebrew/test/formula_support_spec.rb
index 31fc879d8..d20fedddf 100644
--- a/Library/Homebrew/test/formula_support_spec.rb
+++ b/Library/Homebrew/test/formula_support_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula_support"
 
 describe KegOnlyReason do
diff --git a/Library/Homebrew/test/formula_validation_spec.rb b/Library/Homebrew/test/formula_validation_spec.rb
index ff50c86d1..53c679e8d 100644
--- a/Library/Homebrew/test/formula_validation_spec.rb
+++ b/Library/Homebrew/test/formula_validation_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 
 describe Formula do
diff --git a/Library/Homebrew/test/formulary_spec.rb b/Library/Homebrew/test/formulary_spec.rb
index 14df97fd4..326657456 100644
--- a/Library/Homebrew/test/formulary_spec.rb
+++ b/Library/Homebrew/test/formulary_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formula"
 require "formula_installer"
 require "utils/bottles"
diff --git a/Library/Homebrew/test/hardware/cpu_spec.rb b/Library/Homebrew/test/hardware/cpu_spec.rb
index c9b5829b2..0a6f2101c 100644
--- a/Library/Homebrew/test/hardware/cpu_spec.rb
+++ b/Library/Homebrew/test/hardware/cpu_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "hardware"
 
 describe Hardware::CPU do
diff --git a/Library/Homebrew/test/inreplace_spec.rb b/Library/Homebrew/test/inreplace_spec.rb
index 896b19f5a..2491c8b87 100644
--- a/Library/Homebrew/test/inreplace_spec.rb
+++ b/Library/Homebrew/test/inreplace_spec.rb
@@ -1,9 +1,11 @@
+# frozen_string_literal: true
+
 require "extend/string"
 require "tempfile"
 require "utils/inreplace"
 
 describe StringInreplaceExtension do
-  subject { string.extend(described_class) }
+  subject { string.dup.extend(described_class) }
 
   describe "#change_make_var!" do
     context "flag" do
diff --git a/Library/Homebrew/test/java_requirement_spec.rb b/Library/Homebrew/test/java_requirement_spec.rb
index 859c2d9fb..f851136a0 100644
--- a/Library/Homebrew/test/java_requirement_spec.rb
+++ b/Library/Homebrew/test/java_requirement_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirements/java_requirement"
 
 describe JavaRequirement do
diff --git a/Library/Homebrew/test/keg_spec.rb b/Library/Homebrew/test/keg_spec.rb
index 3c06f5b1c..2df44f9b1 100644
--- a/Library/Homebrew/test/keg_spec.rb
+++ b/Library/Homebrew/test/keg_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "keg"
 require "stringio"
 
diff --git a/Library/Homebrew/test/language/go_spec.rb b/Library/Homebrew/test/language/go_spec.rb
index 1625b7f78..ac631f38c 100644
--- a/Library/Homebrew/test/language/go_spec.rb
+++ b/Library/Homebrew/test/language/go_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "language/go"
 
 describe Language::Go do
diff --git a/Library/Homebrew/test/language/java_spec.rb b/Library/Homebrew/test/language/java_spec.rb
index 32b6de1b6..59d49e5e6 100644
--- a/Library/Homebrew/test/language/java_spec.rb
+++ b/Library/Homebrew/test/language/java_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "language/java"
 
 describe Language::Java do
diff --git a/Library/Homebrew/test/language/node_spec.rb b/Library/Homebrew/test/language/node_spec.rb
index 7632a5dc0..0501297b7 100644
--- a/Library/Homebrew/test/language/node_spec.rb
+++ b/Library/Homebrew/test/language/node_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "language/node"
 
 describe Language::Node do
diff --git a/Library/Homebrew/test/language/python_spec.rb b/Library/Homebrew/test/language/python_spec.rb
index fb2b92425..a474e04da 100644
--- a/Library/Homebrew/test/language/python_spec.rb
+++ b/Library/Homebrew/test/language/python_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "language/python"
 require "resource"
 
diff --git a/Library/Homebrew/test/lazy_object_spec.rb b/Library/Homebrew/test/lazy_object_spec.rb
index 77e3f23f8..57ca637fa 100644
--- a/Library/Homebrew/test/lazy_object_spec.rb
+++ b/Library/Homebrew/test/lazy_object_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "lazy_object"
 
 describe LazyObject do
diff --git a/Library/Homebrew/test/linkage_cache_store_spec.rb b/Library/Homebrew/test/linkage_cache_store_spec.rb
index 0b1d6a8d7..51dec2b1d 100644
--- a/Library/Homebrew/test/linkage_cache_store_spec.rb
+++ b/Library/Homebrew/test/linkage_cache_store_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "linkage_cache_store"
 
 describe LinkageCacheStore do
diff --git a/Library/Homebrew/test/locale_spec.rb b/Library/Homebrew/test/locale_spec.rb
index 819a2f275..f76186134 100644
--- a/Library/Homebrew/test/locale_spec.rb
+++ b/Library/Homebrew/test/locale_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "locale"
 
 describe Locale do
diff --git a/Library/Homebrew/test/lock_file_spec.rb b/Library/Homebrew/test/lock_file_spec.rb
index 82c47a70a..f9e949648 100644
--- a/Library/Homebrew/test/lock_file_spec.rb
+++ b/Library/Homebrew/test/lock_file_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "lock_file"
 
 describe LockFile do
diff --git a/Library/Homebrew/test/messages_spec.rb b/Library/Homebrew/test/messages_spec.rb
index 527b35d23..69a20b92e 100644
--- a/Library/Homebrew/test/messages_spec.rb
+++ b/Library/Homebrew/test/messages_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "messages"
 require "spec_helper"
 
diff --git a/Library/Homebrew/test/migrator_spec.rb b/Library/Homebrew/test/migrator_spec.rb
index f189e7a10..e17a4bf44 100644
--- a/Library/Homebrew/test/migrator_spec.rb
+++ b/Library/Homebrew/test/migrator_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "migrator"
 require "test/support/fixtures/testball"
 require "tab"
diff --git a/Library/Homebrew/test/missing_formula_spec.rb b/Library/Homebrew/test/missing_formula_spec.rb
index 8fd86c510..30c21b09a 100644
--- a/Library/Homebrew/test/missing_formula_spec.rb
+++ b/Library/Homebrew/test/missing_formula_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "missing_formula"
 
 describe Homebrew::MissingFormula do
diff --git a/Library/Homebrew/test/options_spec.rb b/Library/Homebrew/test/options_spec.rb
index 770485cc8..b864fe662 100644
--- a/Library/Homebrew/test/options_spec.rb
+++ b/Library/Homebrew/test/options_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "options"
 
 describe Option do
diff --git a/Library/Homebrew/test/os/linux/dependency_collector_spec.rb b/Library/Homebrew/test/os/linux/dependency_collector_spec.rb
index 52f2d750b..0bc48fc0d 100644
--- a/Library/Homebrew/test/os/linux/dependency_collector_spec.rb
+++ b/Library/Homebrew/test/os/linux/dependency_collector_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "dependency_collector"
 
 describe DependencyCollector do
diff --git a/Library/Homebrew/test/os/linux/diagnostic_spec.rb b/Library/Homebrew/test/os/linux/diagnostic_spec.rb
index d5d85cc0f..4c1b2cf5a 100644
--- a/Library/Homebrew/test/os/linux/diagnostic_spec.rb
+++ b/Library/Homebrew/test/os/linux/diagnostic_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "diagnostic"
 
 describe Homebrew::Diagnostic::Checks do
diff --git a/Library/Homebrew/test/os/mac/dependency_collector_spec.rb b/Library/Homebrew/test/os/mac/dependency_collector_spec.rb
index 90a23f375..842cf3c5f 100644
--- a/Library/Homebrew/test/os/mac/dependency_collector_spec.rb
+++ b/Library/Homebrew/test/os/mac/dependency_collector_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "dependency_collector"
 
 describe DependencyCollector do
diff --git a/Library/Homebrew/test/os/mac/diagnostic_spec.rb b/Library/Homebrew/test/os/mac/diagnostic_spec.rb
index 91a94eb89..353a4e7b6 100644
--- a/Library/Homebrew/test/os/mac/diagnostic_spec.rb
+++ b/Library/Homebrew/test/os/mac/diagnostic_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "diagnostic"
 
 describe Homebrew::Diagnostic::Checks do
diff --git a/Library/Homebrew/test/os/mac/java_requirement_spec.rb b/Library/Homebrew/test/os/mac/java_requirement_spec.rb
index afb17d742..97c8606f9 100644
--- a/Library/Homebrew/test/os/mac/java_requirement_spec.rb
+++ b/Library/Homebrew/test/os/mac/java_requirement_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirements/java_requirement"
 require "fileutils"
 
diff --git a/Library/Homebrew/test/os/mac/keg_spec.rb b/Library/Homebrew/test/os/mac/keg_spec.rb
index c1786f5d3..b70068c95 100644
--- a/Library/Homebrew/test/os/mac/keg_spec.rb
+++ b/Library/Homebrew/test/os/mac/keg_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "keg"
 
 describe Keg do
diff --git a/Library/Homebrew/test/os/mac/mach_spec.rb b/Library/Homebrew/test/os/mac/mach_spec.rb
index f07f45b78..c10a661f9 100644
--- a/Library/Homebrew/test/os/mac/mach_spec.rb
+++ b/Library/Homebrew/test/os/mac/mach_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe "Mach-O Pathname tests" do
   specify "fat dylib" do
     pn = dylib_path("fat")
diff --git a/Library/Homebrew/test/os/mac/version_spec.rb b/Library/Homebrew/test/os/mac/version_spec.rb
index a74f54146..0901b0aae 100644
--- a/Library/Homebrew/test/os/mac/version_spec.rb
+++ b/Library/Homebrew/test/os/mac/version_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "version"
 require "os/mac/version"
 
diff --git a/Library/Homebrew/test/os/mac_spec.rb b/Library/Homebrew/test/os/mac_spec.rb
index 97f15dd61..dcb04a77a 100644
--- a/Library/Homebrew/test/os/mac_spec.rb
+++ b/Library/Homebrew/test/os/mac_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "locale"
 require "os/mac"
 
diff --git a/Library/Homebrew/test/patch_spec.rb b/Library/Homebrew/test/patch_spec.rb
index d29630c6b..463894ff4 100644
--- a/Library/Homebrew/test/patch_spec.rb
+++ b/Library/Homebrew/test/patch_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "patch"
 
 describe Patch do
diff --git a/Library/Homebrew/test/patching_spec.rb b/Library/Homebrew/test/patching_spec.rb
index a03bae8ed..b921bb5d7 100644
--- a/Library/Homebrew/test/patching_spec.rb
+++ b/Library/Homebrew/test/patching_spec.rb
@@ -1,15 +1,17 @@
+# frozen_string_literal: true
+
 require "formula"
 
 describe "patching" do
-  TESTBALL_URL = "file://#{TEST_FIXTURE_DIR}/tarballs/testball-0.1.tbz".freeze
-  TESTBALL_PATCHES_URL = "file://#{TEST_FIXTURE_DIR}/tarballs/testball-0.1-patches.tgz".freeze
-  PATCH_URL_A = "file://#{TEST_FIXTURE_DIR}/patches/noop-a.diff".freeze
-  PATCH_URL_B = "file://#{TEST_FIXTURE_DIR}/patches/noop-b.diff".freeze
+  TESTBALL_URL = "file://#{TEST_FIXTURE_DIR}/tarballs/testball-0.1.tbz"
+  TESTBALL_PATCHES_URL = "file://#{TEST_FIXTURE_DIR}/tarballs/testball-0.1-patches.tgz"
+  PATCH_URL_A = "file://#{TEST_FIXTURE_DIR}/patches/noop-a.diff"
+  PATCH_URL_B = "file://#{TEST_FIXTURE_DIR}/patches/noop-b.diff"
   PATCH_A_CONTENTS = File.read("#{TEST_FIXTURE_DIR}/patches/noop-a.diff").freeze
   PATCH_B_CONTENTS = File.read("#{TEST_FIXTURE_DIR}/patches/noop-b.diff").freeze
-  APPLY_A = "noop-a.diff".freeze
-  APPLY_B = "noop-b.diff".freeze
-  APPLY_C = "noop-c.diff".freeze
+  APPLY_A = "noop-a.diff"
+  APPLY_B = "noop-b.diff"
+  APPLY_C = "noop-c.diff"
 
   def formula(name = "formula_name", path: Formulary.core_path(name), spec: :stable, alias_path: nil, &block)
     Class.new(Formula) {
diff --git a/Library/Homebrew/test/pathname_spec.rb b/Library/Homebrew/test/pathname_spec.rb
index 196742021..454460796 100644
--- a/Library/Homebrew/test/pathname_spec.rb
+++ b/Library/Homebrew/test/pathname_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "extend/pathname"
 require "install_renamed"
 
diff --git a/Library/Homebrew/test/pkg_version_spec.rb b/Library/Homebrew/test/pkg_version_spec.rb
index b1cceb32c..8e456ad62 100644
--- a/Library/Homebrew/test/pkg_version_spec.rb
+++ b/Library/Homebrew/test/pkg_version_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "pkg_version"
 
 describe PkgVersion do
diff --git a/Library/Homebrew/test/requirement_spec.rb b/Library/Homebrew/test/requirement_spec.rb
index 43a3e34fe..e199ad7df 100644
--- a/Library/Homebrew/test/requirement_spec.rb
+++ b/Library/Homebrew/test/requirement_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "extend/ENV"
 require "requirement"
 
diff --git a/Library/Homebrew/test/requirements/codesign_requirement_spec.rb b/Library/Homebrew/test/requirements/codesign_requirement_spec.rb
index 5940c6d6f..483104bce 100644
--- a/Library/Homebrew/test/requirements/codesign_requirement_spec.rb
+++ b/Library/Homebrew/test/requirements/codesign_requirement_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirements/codesign_requirement"
 
 describe CodesignRequirement do
diff --git a/Library/Homebrew/test/requirements/java_requirement_spec.rb b/Library/Homebrew/test/requirements/java_requirement_spec.rb
index 50e29b209..969532d0c 100644
--- a/Library/Homebrew/test/requirements/java_requirement_spec.rb
+++ b/Library/Homebrew/test/requirements/java_requirement_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirements/java_requirement"
 
 describe JavaRequirement do
diff --git a/Library/Homebrew/test/requirements/linux_requirement_spec.rb b/Library/Homebrew/test/requirements/linux_requirement_spec.rb
index 3d456f1f1..cb8d3a34d 100644
--- a/Library/Homebrew/test/requirements/linux_requirement_spec.rb
+++ b/Library/Homebrew/test/requirements/linux_requirement_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirements/linux_requirement"
 
 describe LinuxRequirement do
diff --git a/Library/Homebrew/test/requirements/macos_requirement_spec.rb b/Library/Homebrew/test/requirements/macos_requirement_spec.rb
index 7828e7318..71d080e55 100644
--- a/Library/Homebrew/test/requirements/macos_requirement_spec.rb
+++ b/Library/Homebrew/test/requirements/macos_requirement_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirements/macos_requirement"
 
 describe MacOSRequirement do
diff --git a/Library/Homebrew/test/requirements/osxfuse_requirement_spec.rb b/Library/Homebrew/test/requirements/osxfuse_requirement_spec.rb
index 59a355307..0737bd8e5 100644
--- a/Library/Homebrew/test/requirements/osxfuse_requirement_spec.rb
+++ b/Library/Homebrew/test/requirements/osxfuse_requirement_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirements/osxfuse_requirement"
 
 describe OsxfuseRequirement do
diff --git a/Library/Homebrew/test/requirements_spec.rb b/Library/Homebrew/test/requirements_spec.rb
index 7ad7cb7f3..f20e7bc9e 100644
--- a/Library/Homebrew/test/requirements_spec.rb
+++ b/Library/Homebrew/test/requirements_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirements"
 
 describe Requirements do
diff --git a/Library/Homebrew/test/resource_spec.rb b/Library/Homebrew/test/resource_spec.rb
index 6bc514e63..fde2eacac 100644
--- a/Library/Homebrew/test/resource_spec.rb
+++ b/Library/Homebrew/test/resource_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "resource"
 
 describe Resource do
diff --git a/Library/Homebrew/test/rubocop_spec.rb b/Library/Homebrew/test/rubocop_spec.rb
index 64f86ad44..7ac9cd58a 100644
--- a/Library/Homebrew/test/rubocop_spec.rb
+++ b/Library/Homebrew/test/rubocop_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "open3"
 
 describe "RuboCop" do
diff --git a/Library/Homebrew/test/rubocops/cask/homepage_matches_url_spec.rb b/Library/Homebrew/test/rubocops/cask/homepage_matches_url_spec.rb
index c863e9e06..05c32ba66 100644
--- a/Library/Homebrew/test/rubocops/cask/homepage_matches_url_spec.rb
+++ b/Library/Homebrew/test/rubocops/cask/homepage_matches_url_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/rubocop-cask"
 require "test/rubocops/cask/shared_examples/cask_cop"
 
diff --git a/Library/Homebrew/test/rubocops/cask/homepage_url_trailing_slash_spec.rb b/Library/Homebrew/test/rubocops/cask/homepage_url_trailing_slash_spec.rb
index 9eaf31f22..81fea8a00 100644
--- a/Library/Homebrew/test/rubocops/cask/homepage_url_trailing_slash_spec.rb
+++ b/Library/Homebrew/test/rubocops/cask/homepage_url_trailing_slash_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/rubocop-cask"
 require "test/rubocops/cask/shared_examples/cask_cop"
 
diff --git a/Library/Homebrew/test/rubocops/cask/no_dsl_version_spec.rb b/Library/Homebrew/test/rubocops/cask/no_dsl_version_spec.rb
index 30e32b47f..9f52bd7bf 100644
--- a/Library/Homebrew/test/rubocops/cask/no_dsl_version_spec.rb
+++ b/Library/Homebrew/test/rubocops/cask/no_dsl_version_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/rubocop-cask"
 require "test/rubocops/cask/shared_examples/cask_cop"
 
diff --git a/Library/Homebrew/test/rubocops/cask/shared_examples/cask_cop.rb b/Library/Homebrew/test/rubocops/cask/shared_examples/cask_cop.rb
index 0da2c06b7..3a11d6be0 100644
--- a/Library/Homebrew/test/rubocops/cask/shared_examples/cask_cop.rb
+++ b/Library/Homebrew/test/rubocops/cask/shared_examples/cask_cop.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module CaskCop
   shared_examples "does not report any offenses" do
     it "does not report any offenses" do
diff --git a/Library/Homebrew/test/rubocops/cask/stanza_grouping_spec.rb b/Library/Homebrew/test/rubocops/cask/stanza_grouping_spec.rb
index 6e34f7ffb..c8a70a286 100644
--- a/Library/Homebrew/test/rubocops/cask/stanza_grouping_spec.rb
+++ b/Library/Homebrew/test/rubocops/cask/stanza_grouping_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/rubocop-cask"
 require "test/rubocops/cask/shared_examples/cask_cop"
 
diff --git a/Library/Homebrew/test/rubocops/cask/stanza_order_spec.rb b/Library/Homebrew/test/rubocops/cask/stanza_order_spec.rb
index a73f2ca3f..7db8ab727 100644
--- a/Library/Homebrew/test/rubocops/cask/stanza_order_spec.rb
+++ b/Library/Homebrew/test/rubocops/cask/stanza_order_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/rubocop-cask"
 require "test/rubocops/cask/shared_examples/cask_cop"
 
diff --git a/Library/Homebrew/test/rubocops/caveats_spec.rb b/Library/Homebrew/test/rubocops/caveats_spec.rb
index c2b826630..a19e8ab8f 100644
--- a/Library/Homebrew/test/rubocops/caveats_spec.rb
+++ b/Library/Homebrew/test/rubocops/caveats_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/caveats"
 
 describe RuboCop::Cop::FormulaAudit::Caveats do
diff --git a/Library/Homebrew/test/rubocops/checksum_spec.rb b/Library/Homebrew/test/rubocops/checksum_spec.rb
index 31206c9f5..0d3f0e542 100644
--- a/Library/Homebrew/test/rubocops/checksum_spec.rb
+++ b/Library/Homebrew/test/rubocops/checksum_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/checksum"
 
 describe RuboCop::Cop::FormulaAudit::Checksum do
diff --git a/Library/Homebrew/test/rubocops/class_spec.rb b/Library/Homebrew/test/rubocops/class_spec.rb
index 070f6e9ab..617e7204e 100644
--- a/Library/Homebrew/test/rubocops/class_spec.rb
+++ b/Library/Homebrew/test/rubocops/class_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/class"
 
 describe RuboCop::Cop::FormulaAudit::ClassName do
diff --git a/Library/Homebrew/test/rubocops/components_order_spec.rb b/Library/Homebrew/test/rubocops/components_order_spec.rb
index c47a85cc4..3faa59442 100644
--- a/Library/Homebrew/test/rubocops/components_order_spec.rb
+++ b/Library/Homebrew/test/rubocops/components_order_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/components_order"
 
 describe RuboCop::Cop::FormulaAudit::ComponentsOrder do
diff --git a/Library/Homebrew/test/rubocops/components_redundancy_spec.rb b/Library/Homebrew/test/rubocops/components_redundancy_spec.rb
index 9a1943e42..30672ec9d 100644
--- a/Library/Homebrew/test/rubocops/components_redundancy_spec.rb
+++ b/Library/Homebrew/test/rubocops/components_redundancy_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/components_redundancy"
 
 describe RuboCop::Cop::FormulaAudit::ComponentsRedundancy do
diff --git a/Library/Homebrew/test/rubocops/conflicts_spec.rb b/Library/Homebrew/test/rubocops/conflicts_spec.rb
index 5e45e4593..db8fa42e5 100644
--- a/Library/Homebrew/test/rubocops/conflicts_spec.rb
+++ b/Library/Homebrew/test/rubocops/conflicts_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/conflicts"
 
 describe RuboCop::Cop::FormulaAudit::Conflicts do
diff --git a/Library/Homebrew/test/rubocops/dependency_order_spec.rb b/Library/Homebrew/test/rubocops/dependency_order_spec.rb
index 0f76b7dcb..c724b8956 100644
--- a/Library/Homebrew/test/rubocops/dependency_order_spec.rb
+++ b/Library/Homebrew/test/rubocops/dependency_order_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/dependency_order"
 
 describe RuboCop::Cop::FormulaAudit::DependencyOrder do
diff --git a/Library/Homebrew/test/rubocops/formula_desc_spec.rb b/Library/Homebrew/test/rubocops/formula_desc_spec.rb
index ed52c6089..9aa51fe93 100644
--- a/Library/Homebrew/test/rubocops/formula_desc_spec.rb
+++ b/Library/Homebrew/test/rubocops/formula_desc_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/formula_desc"
 
 describe RuboCop::Cop::FormulaAudit::DescLength do
diff --git a/Library/Homebrew/test/rubocops/homepage_spec.rb b/Library/Homebrew/test/rubocops/homepage_spec.rb
index fd41e89fb..284d501df 100644
--- a/Library/Homebrew/test/rubocops/homepage_spec.rb
+++ b/Library/Homebrew/test/rubocops/homepage_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/homepage"
 
 describe RuboCop::Cop::FormulaAudit::Homepage do
diff --git a/Library/Homebrew/test/rubocops/lines_spec.rb b/Library/Homebrew/test/rubocops/lines_spec.rb
index 193d2b8cd..2ad249718 100644
--- a/Library/Homebrew/test/rubocops/lines_spec.rb
+++ b/Library/Homebrew/test/rubocops/lines_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/lines"
 
 describe RuboCop::Cop::FormulaAudit::Lines do
diff --git a/Library/Homebrew/test/rubocops/options_spec.rb b/Library/Homebrew/test/rubocops/options_spec.rb
index a2eac92d8..487724def 100644
--- a/Library/Homebrew/test/rubocops/options_spec.rb
+++ b/Library/Homebrew/test/rubocops/options_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/options"
 
 describe RuboCop::Cop::FormulaAudit::Options do
diff --git a/Library/Homebrew/test/rubocops/patches_spec.rb b/Library/Homebrew/test/rubocops/patches_spec.rb
index 81f382ecc..efb899d94 100644
--- a/Library/Homebrew/test/rubocops/patches_spec.rb
+++ b/Library/Homebrew/test/rubocops/patches_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/patches"
 
 describe RuboCop::Cop::FormulaAudit::Patches do
diff --git a/Library/Homebrew/test/rubocops/text_spec.rb b/Library/Homebrew/test/rubocops/text_spec.rb
index 39507ba0f..8485c5c4f 100644
--- a/Library/Homebrew/test/rubocops/text_spec.rb
+++ b/Library/Homebrew/test/rubocops/text_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/text"
 
 describe RuboCop::Cop::FormulaAudit::Text do
diff --git a/Library/Homebrew/test/rubocops/urls_spec.rb b/Library/Homebrew/test/rubocops/urls_spec.rb
index 415ed10a7..90f160327 100644
--- a/Library/Homebrew/test/rubocops/urls_spec.rb
+++ b/Library/Homebrew/test/rubocops/urls_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubocops/urls"
 
 describe RuboCop::Cop::FormulaAudit::Urls do
diff --git a/Library/Homebrew/test/sandbox_spec.rb b/Library/Homebrew/test/sandbox_spec.rb
index 965646c45..d2e969468 100644
--- a/Library/Homebrew/test/sandbox_spec.rb
+++ b/Library/Homebrew/test/sandbox_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "sandbox"
 
 describe Sandbox do
diff --git a/Library/Homebrew/test/search_spec.rb b/Library/Homebrew/test/search_spec.rb
index ba44025dd..0f3bfbe6a 100644
--- a/Library/Homebrew/test/search_spec.rb
+++ b/Library/Homebrew/test/search_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "search"
 
 describe Homebrew::Search do
diff --git a/Library/Homebrew/test/searchable_spec.rb b/Library/Homebrew/test/searchable_spec.rb
index 01f0d00be..aaf88c2ea 100644
--- a/Library/Homebrew/test/searchable_spec.rb
+++ b/Library/Homebrew/test/searchable_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "searchable"
 
 describe Searchable do
diff --git a/Library/Homebrew/test/software_spec_spec.rb b/Library/Homebrew/test/software_spec_spec.rb
index a4e81f5db..43293af2f 100644
--- a/Library/Homebrew/test/software_spec_spec.rb
+++ b/Library/Homebrew/test/software_spec_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "software_spec"
 
 describe SoftwareSpec do
diff --git a/Library/Homebrew/test/spec_helper.rb b/Library/Homebrew/test/spec_helper.rb
index 70b2b3d71..c67fd38c2 100644
--- a/Library/Homebrew/test/spec_helper.rb
+++ b/Library/Homebrew/test/spec_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 if ENV["HOMEBREW_TESTS_COVERAGE"]
   require "simplecov"
 
diff --git a/Library/Homebrew/test/string_spec.rb b/Library/Homebrew/test/string_spec.rb
index d698d35ef..ed9cdc2de 100644
--- a/Library/Homebrew/test/string_spec.rb
+++ b/Library/Homebrew/test/string_spec.rb
@@ -1,9 +1,11 @@
+# frozen_string_literal: true
+
 require "extend/string"
 
 describe StringInreplaceExtension do
   subject { string.extend(described_class) }
 
-  let(:string) { "foobar" }
+  let(:string) { +"foobar" }
 
   describe "#sub!" do
     it "adds an error to #errors when no replacement was made" do
diff --git a/Library/Homebrew/test/support/fixtures/failball.rb b/Library/Homebrew/test/support/fixtures/failball.rb
index 125452fec..439645df2 100644
--- a/Library/Homebrew/test/support/fixtures/failball.rb
+++ b/Library/Homebrew/test/support/fixtures/failball.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Failball < Formula
   def initialize(name = "failball", path = Pathname.new(__FILE__).expand_path, spec = :stable, alias_path: nil)
     self.class.instance_eval do
diff --git a/Library/Homebrew/test/support/fixtures/testball.rb b/Library/Homebrew/test/support/fixtures/testball.rb
index ba725f51e..c2d4aa2bb 100644
--- a/Library/Homebrew/test/support/fixtures/testball.rb
+++ b/Library/Homebrew/test/support/fixtures/testball.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Testball < Formula
   def initialize(name = "testball", path = Pathname.new(__FILE__).expand_path, spec = :stable, alias_path: nil)
     self.class.instance_eval do
diff --git a/Library/Homebrew/test/support/fixtures/testball_bottle.rb b/Library/Homebrew/test/support/fixtures/testball_bottle.rb
index 5a6be7c5f..f6268ed4f 100644
--- a/Library/Homebrew/test/support/fixtures/testball_bottle.rb
+++ b/Library/Homebrew/test/support/fixtures/testball_bottle.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class TestballBottle < Formula
   def initialize(name = "testball_bottle", path = Pathname.new(__FILE__).expand_path, spec = :stable, alias_path: nil)
     self.class.instance_eval do
diff --git a/Library/Homebrew/test/support/helper/cask/fake_system_command.rb b/Library/Homebrew/test/support/helper/cask/fake_system_command.rb
index dafb8a647..2f767ae9c 100644
--- a/Library/Homebrew/test/support/helper/cask/fake_system_command.rb
+++ b/Library/Homebrew/test/support/helper/cask/fake_system_command.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 def sudo(*args)
   ["/usr/bin/sudo", "-E", "--"] + args.flatten
 end
diff --git a/Library/Homebrew/test/support/helper/cask/install_helper.rb b/Library/Homebrew/test/support/helper/cask/install_helper.rb
index eb206c0bd..25ba7ea17 100644
--- a/Library/Homebrew/test/support/helper/cask/install_helper.rb
+++ b/Library/Homebrew/test/support/helper/cask/install_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module InstallHelper
   module_function
 
diff --git a/Library/Homebrew/test/support/helper/cask/never_sudo_system_command.rb b/Library/Homebrew/test/support/helper/cask/never_sudo_system_command.rb
index 7842d4b17..be2570a0c 100644
--- a/Library/Homebrew/test/support/helper/cask/never_sudo_system_command.rb
+++ b/Library/Homebrew/test/support/helper/cask/never_sudo_system_command.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "system_command"
 
 class NeverSudoSystemCommand < SystemCommand
diff --git a/Library/Homebrew/test/support/helper/fixtures.rb b/Library/Homebrew/test/support/helper/fixtures.rb
index 460fb4aef..fc5cf48c8 100644
--- a/Library/Homebrew/test/support/helper/fixtures.rb
+++ b/Library/Homebrew/test/support/helper/fixtures.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Test
   module Helper
     module Fixtures
diff --git a/Library/Homebrew/test/support/helper/formula.rb b/Library/Homebrew/test/support/helper/formula.rb
index 7f55f4b66..36fe7f280 100644
--- a/Library/Homebrew/test/support/helper/formula.rb
+++ b/Library/Homebrew/test/support/helper/formula.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "formulary"
 
 module Test
diff --git a/Library/Homebrew/test/support/helper/integration_mocks.rb b/Library/Homebrew/test/support/helper/integration_mocks.rb
index 6effb0cde..2e4ec4b26 100644
--- a/Library/Homebrew/test/support/helper/integration_mocks.rb
+++ b/Library/Homebrew/test/support/helper/integration_mocks.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Homebrew
   module Diagnostic
     class Checks
diff --git a/Library/Homebrew/test/support/helper/mktmpdir.rb b/Library/Homebrew/test/support/helper/mktmpdir.rb
index 651d08e54..6cb369c41 100644
--- a/Library/Homebrew/test/support/helper/mktmpdir.rb
+++ b/Library/Homebrew/test/support/helper/mktmpdir.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Test
   module Helper
     module MkTmpDir
diff --git a/Library/Homebrew/test/support/helper/output_as_tty.rb b/Library/Homebrew/test/support/helper/output_as_tty.rb
index eb5d4c219..ca7f4ca66 100644
--- a/Library/Homebrew/test/support/helper/output_as_tty.rb
+++ b/Library/Homebrew/test/support/helper/output_as_tty.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "delegate"
 
 module Test
diff --git a/Library/Homebrew/test/support/helper/spec/shared_context/homebrew_cask.rb b/Library/Homebrew/test/support/helper/spec/shared_context/homebrew_cask.rb
index 60596a899..21537b41c 100644
--- a/Library/Homebrew/test/support/helper/spec/shared_context/homebrew_cask.rb
+++ b/Library/Homebrew/test/support/helper/spec/shared_context/homebrew_cask.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cask/all"
 
 require "test/support/helper/cask/fake_system_command"
diff --git a/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb b/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb
index f79df38dd..25a3dffc8 100644
--- a/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb
+++ b/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "open3"
 
 require "formula_installer"
diff --git a/Library/Homebrew/test/support/lib/config.rb b/Library/Homebrew/test/support/lib/config.rb
index 126c66b6c..b9cb738c9 100644
--- a/Library/Homebrew/test/support/lib/config.rb
+++ b/Library/Homebrew/test/support/lib/config.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 raise "HOMEBREW_BREW_FILE was not exported! Please call bin/brew directly!" unless ENV["HOMEBREW_BREW_FILE"]
 
 require "pathname"
@@ -34,13 +36,13 @@ HOMEBREW_TEMP          = (HOMEBREW_PREFIX.parent/"temp").freeze
 
 TEST_FIXTURE_DIR = (HOMEBREW_LIBRARY_PATH/"test/support/fixtures").freeze
 
-TESTBALL_SHA256 = "91e3f7930c98d7ccfb288e115ed52d06b0e5bc16fec7dce8bdda86530027067b".freeze
-TESTBALL_PATCHES_SHA256 = "799c2d551ac5c3a5759bea7796631a7906a6a24435b52261a317133a0bfb34d9".freeze
-PATCH_A_SHA256 = "83404f4936d3257e65f176c4ffb5a5b8d6edd644a21c8d8dcc73e22a6d28fcfa".freeze
-PATCH_B_SHA256 = "57958271bb802a59452d0816e0670d16c8b70bdf6530bcf6f78726489ad89b90".freeze
+TESTBALL_SHA256 = "91e3f7930c98d7ccfb288e115ed52d06b0e5bc16fec7dce8bdda86530027067b"
+TESTBALL_PATCHES_SHA256 = "799c2d551ac5c3a5759bea7796631a7906a6a24435b52261a317133a0bfb34d9"
+PATCH_A_SHA256 = "83404f4936d3257e65f176c4ffb5a5b8d6edd644a21c8d8dcc73e22a6d28fcfa"
+PATCH_B_SHA256 = "57958271bb802a59452d0816e0670d16c8b70bdf6530bcf6f78726489ad89b90"
 
-TEST_SHA1   = "deadbeefdeadbeefdeadbeefdeadbeefdeadbeef".freeze
-TEST_SHA256 = "deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef".freeze
+TEST_SHA1   = "deadbeefdeadbeefdeadbeefdeadbeefdeadbeef"
+TEST_SHA256 = "deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef"
 
 # For testing's sake always assume the default prefix
 module Homebrew
diff --git a/Library/Homebrew/test/support/no_seed_progress_formatter.rb b/Library/Homebrew/test/support/no_seed_progress_formatter.rb
index e87a58143..d6199bd9a 100644
--- a/Library/Homebrew/test/support/no_seed_progress_formatter.rb
+++ b/Library/Homebrew/test/support/no_seed_progress_formatter.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rspec/core/formatters/progress_formatter"
 
 class NoSeedProgressFormatter < RSpec::Core::Formatters::ProgressFormatter
diff --git a/Library/Homebrew/test/system_command_result_spec.rb b/Library/Homebrew/test/system_command_result_spec.rb
index 9d48d3425..c76cb5d6f 100644
--- a/Library/Homebrew/test/system_command_result_spec.rb
+++ b/Library/Homebrew/test/system_command_result_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "system_command"
 
 describe SystemCommand::Result do
diff --git a/Library/Homebrew/test/system_command_spec.rb b/Library/Homebrew/test/system_command_spec.rb
index aeef194d4..56241ac33 100644
--- a/Library/Homebrew/test/system_command_spec.rb
+++ b/Library/Homebrew/test/system_command_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe SystemCommand do
   describe "#initialize" do
     subject(:command) {
diff --git a/Library/Homebrew/test/tab_spec.rb b/Library/Homebrew/test/tab_spec.rb
index b3ae241b8..bcb233ef2 100644
--- a/Library/Homebrew/test/tab_spec.rb
+++ b/Library/Homebrew/test/tab_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "tab"
 require "formula"
 
diff --git a/Library/Homebrew/test/tap_spec.rb b/Library/Homebrew/test/tap_spec.rb
index 56d6fc9a9..699fb5293 100644
--- a/Library/Homebrew/test/tap_spec.rb
+++ b/Library/Homebrew/test/tap_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Tap do
   alias_matcher :have_formula_file, :be_formula_file
   alias_matcher :have_custom_remote, :be_custom_remote
diff --git a/Library/Homebrew/test/unpack_strategy/bazaar_spec.rb b/Library/Homebrew/test/unpack_strategy/bazaar_spec.rb
index dac93a05e..434a76a94 100644
--- a/Library/Homebrew/test/unpack_strategy/bazaar_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/bazaar_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Bazaar do
diff --git a/Library/Homebrew/test/unpack_strategy/bzip2_spec.rb b/Library/Homebrew/test/unpack_strategy/bzip2_spec.rb
index 5bb2b5dc8..a81f15bab 100644
--- a/Library/Homebrew/test/unpack_strategy/bzip2_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/bzip2_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Bzip2 do
diff --git a/Library/Homebrew/test/unpack_strategy/cvs_spec.rb b/Library/Homebrew/test/unpack_strategy/cvs_spec.rb
index b3addd4cb..8eebf17da 100644
--- a/Library/Homebrew/test/unpack_strategy/cvs_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/cvs_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Cvs do
diff --git a/Library/Homebrew/test/unpack_strategy/directory_spec.rb b/Library/Homebrew/test/unpack_strategy/directory_spec.rb
index f7ceedd67..1207454ae 100644
--- a/Library/Homebrew/test/unpack_strategy/directory_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/directory_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Directory do
diff --git a/Library/Homebrew/test/unpack_strategy/dmg_spec.rb b/Library/Homebrew/test/unpack_strategy/dmg_spec.rb
index a572ea3a0..8a3594f14 100644
--- a/Library/Homebrew/test/unpack_strategy/dmg_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/dmg_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Dmg, :needs_macos do
diff --git a/Library/Homebrew/test/unpack_strategy/git_spec.rb b/Library/Homebrew/test/unpack_strategy/git_spec.rb
index a499c8a79..738146a78 100644
--- a/Library/Homebrew/test/unpack_strategy/git_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/git_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Git do
diff --git a/Library/Homebrew/test/unpack_strategy/gzip_spec.rb b/Library/Homebrew/test/unpack_strategy/gzip_spec.rb
index 38d12c173..ebf4a493b 100644
--- a/Library/Homebrew/test/unpack_strategy/gzip_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/gzip_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Gzip do
diff --git a/Library/Homebrew/test/unpack_strategy/jar_spec.rb b/Library/Homebrew/test/unpack_strategy/jar_spec.rb
index 3b5f36ed9..f6da64b97 100644
--- a/Library/Homebrew/test/unpack_strategy/jar_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/jar_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Jar, :needs_unzip do
diff --git a/Library/Homebrew/test/unpack_strategy/lha_spec.rb b/Library/Homebrew/test/unpack_strategy/lha_spec.rb
index 7e70844a8..e24a60a65 100644
--- a/Library/Homebrew/test/unpack_strategy/lha_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/lha_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Lha do
diff --git a/Library/Homebrew/test/unpack_strategy/lzip_spec.rb b/Library/Homebrew/test/unpack_strategy/lzip_spec.rb
index 119eb213b..a74b68add 100644
--- a/Library/Homebrew/test/unpack_strategy/lzip_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/lzip_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Lzip do
diff --git a/Library/Homebrew/test/unpack_strategy/mercurial_spec.rb b/Library/Homebrew/test/unpack_strategy/mercurial_spec.rb
index edd22a5bb..76a28e27b 100644
--- a/Library/Homebrew/test/unpack_strategy/mercurial_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/mercurial_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Mercurial do
diff --git a/Library/Homebrew/test/unpack_strategy/p7zip_spec.rb b/Library/Homebrew/test/unpack_strategy/p7zip_spec.rb
index 33a56923f..c612b13f0 100644
--- a/Library/Homebrew/test/unpack_strategy/p7zip_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/p7zip_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::P7Zip do
diff --git a/Library/Homebrew/test/unpack_strategy/rar_spec.rb b/Library/Homebrew/test/unpack_strategy/rar_spec.rb
index 0f315b174..5e5e59333 100644
--- a/Library/Homebrew/test/unpack_strategy/rar_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/rar_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Rar do
diff --git a/Library/Homebrew/test/unpack_strategy/shared_examples.rb b/Library/Homebrew/test/unpack_strategy/shared_examples.rb
index 285de1c3e..6f3caa475 100644
--- a/Library/Homebrew/test/unpack_strategy/shared_examples.rb
+++ b/Library/Homebrew/test/unpack_strategy/shared_examples.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "unpack_strategy"
 
 shared_examples "UnpackStrategy::detect" do
diff --git a/Library/Homebrew/test/unpack_strategy/subversion_spec.rb b/Library/Homebrew/test/unpack_strategy/subversion_spec.rb
index cec416a32..dc818221b 100644
--- a/Library/Homebrew/test/unpack_strategy/subversion_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/subversion_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Subversion, :needs_svn do
diff --git a/Library/Homebrew/test/unpack_strategy/tar_spec.rb b/Library/Homebrew/test/unpack_strategy/tar_spec.rb
index 0f748f5d6..ae11929b3 100644
--- a/Library/Homebrew/test/unpack_strategy/tar_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/tar_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Tar do
diff --git a/Library/Homebrew/test/unpack_strategy/uncompressed_spec.rb b/Library/Homebrew/test/unpack_strategy/uncompressed_spec.rb
index 9d0825712..8e8c5d923 100644
--- a/Library/Homebrew/test/unpack_strategy/uncompressed_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/uncompressed_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Uncompressed do
diff --git a/Library/Homebrew/test/unpack_strategy/xar_spec.rb b/Library/Homebrew/test/unpack_strategy/xar_spec.rb
index 61257d349..f4f11389d 100644
--- a/Library/Homebrew/test/unpack_strategy/xar_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/xar_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Xar, :needs_macos do
diff --git a/Library/Homebrew/test/unpack_strategy/xz_spec.rb b/Library/Homebrew/test/unpack_strategy/xz_spec.rb
index 6374833a7..ffc41369a 100644
--- a/Library/Homebrew/test/unpack_strategy/xz_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/xz_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Xz do
diff --git a/Library/Homebrew/test/unpack_strategy/zip_spec.rb b/Library/Homebrew/test/unpack_strategy/zip_spec.rb
index 774cf36fe..c579fff51 100644
--- a/Library/Homebrew/test/unpack_strategy/zip_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy/zip_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "shared_examples"
 
 describe UnpackStrategy::Zip do
diff --git a/Library/Homebrew/test/unpack_strategy_spec.rb b/Library/Homebrew/test/unpack_strategy_spec.rb
index 62bbc29ea..bfcbc2421 100644
--- a/Library/Homebrew/test/unpack_strategy_spec.rb
+++ b/Library/Homebrew/test/unpack_strategy_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe UnpackStrategy do
   describe "#extract_nestedly" do
     subject(:strategy) { described_class.detect(path) }
diff --git a/Library/Homebrew/test/utils/analytics_spec.rb b/Library/Homebrew/test/utils/analytics_spec.rb
index 29bdd0438..8827c8012 100644
--- a/Library/Homebrew/test/utils/analytics_spec.rb
+++ b/Library/Homebrew/test/utils/analytics_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/analytics"
 require "formula_installer"
 
diff --git a/Library/Homebrew/test/utils/bottles/bintray_spec.rb b/Library/Homebrew/test/utils/bottles/bintray_spec.rb
index a7dfc00ea..87a9a7c7e 100644
--- a/Library/Homebrew/test/utils/bottles/bintray_spec.rb
+++ b/Library/Homebrew/test/utils/bottles/bintray_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/bottles"
 
 describe Utils::Bottles::Bintray do
diff --git a/Library/Homebrew/test/utils/bottles/bottles_spec.rb b/Library/Homebrew/test/utils/bottles/bottles_spec.rb
index fcaaa1db5..3cb3e7697 100644
--- a/Library/Homebrew/test/utils/bottles/bottles_spec.rb
+++ b/Library/Homebrew/test/utils/bottles/bottles_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/bottles"
 
 describe Utils::Bottles do
diff --git a/Library/Homebrew/test/utils/bottles/collector_spec.rb b/Library/Homebrew/test/utils/bottles/collector_spec.rb
index 98c3532bf..2efdb0163 100644
--- a/Library/Homebrew/test/utils/bottles/collector_spec.rb
+++ b/Library/Homebrew/test/utils/bottles/collector_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/bottles"
 
 describe Utils::Bottles::Collector do
diff --git a/Library/Homebrew/test/utils/curl_spec.rb b/Library/Homebrew/test/utils/curl_spec.rb
index 3f143c638..a6973aa19 100644
--- a/Library/Homebrew/test/utils/curl_spec.rb
+++ b/Library/Homebrew/test/utils/curl_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/curl"
 
 describe "curl" do
diff --git a/Library/Homebrew/test/utils/fork_spec.rb b/Library/Homebrew/test/utils/fork_spec.rb
index 0af9b8f3a..fa1d27fb3 100644
--- a/Library/Homebrew/test/utils/fork_spec.rb
+++ b/Library/Homebrew/test/utils/fork_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/fork"
 
 describe Utils do
diff --git a/Library/Homebrew/test/utils/git_spec.rb b/Library/Homebrew/test/utils/git_spec.rb
index 9cb4206f0..4160c1587 100644
--- a/Library/Homebrew/test/utils/git_spec.rb
+++ b/Library/Homebrew/test/utils/git_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/git"
 
 describe Git do
diff --git a/Library/Homebrew/test/utils/github_spec.rb b/Library/Homebrew/test/utils/github_spec.rb
index 6e4b0cd4b..936ae03ae 100644
--- a/Library/Homebrew/test/utils/github_spec.rb
+++ b/Library/Homebrew/test/utils/github_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/github"
 
 describe GitHub do
diff --git a/Library/Homebrew/test/utils/popen_spec.rb b/Library/Homebrew/test/utils/popen_spec.rb
index d1ae12d1c..c3f6027cf 100644
--- a/Library/Homebrew/test/utils/popen_spec.rb
+++ b/Library/Homebrew/test/utils/popen_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/popen"
 
 describe Utils do
diff --git a/Library/Homebrew/test/utils/shell_spec.rb b/Library/Homebrew/test/utils/shell_spec.rb
index f92afd4f2..b3a0ae8f7 100644
--- a/Library/Homebrew/test/utils/shell_spec.rb
+++ b/Library/Homebrew/test/utils/shell_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/shell"
 
 describe Utils::Shell do
diff --git a/Library/Homebrew/test/utils/svn_spec.rb b/Library/Homebrew/test/utils/svn_spec.rb
index 69dd9565a..af8b28757 100644
--- a/Library/Homebrew/test/utils/svn_spec.rb
+++ b/Library/Homebrew/test/utils/svn_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/svn"
 
 describe Utils do
diff --git a/Library/Homebrew/test/utils/tty_spec.rb b/Library/Homebrew/test/utils/tty_spec.rb
index 27d18e284..32b259e2b 100644
--- a/Library/Homebrew/test/utils/tty_spec.rb
+++ b/Library/Homebrew/test/utils/tty_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe Tty do
   describe "::strip_ansi" do
     it "removes ANSI escape codes from a string" do
diff --git a/Library/Homebrew/test/utils/user_spec.rb b/Library/Homebrew/test/utils/user_spec.rb
index 50d7ee42b..c26862dc4 100644
--- a/Library/Homebrew/test/utils/user_spec.rb
+++ b/Library/Homebrew/test/utils/user_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/user"
 
 describe User do
diff --git a/Library/Homebrew/test/utils_spec.rb b/Library/Homebrew/test/utils_spec.rb
index 7e6bb9dd2..d27290ef4 100644
--- a/Library/Homebrew/test/utils_spec.rb
+++ b/Library/Homebrew/test/utils_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 describe "globally-scoped helper methods" do
   let(:dir) { mktmpdir }
 
diff --git a/Library/Homebrew/test/version_spec.rb b/Library/Homebrew/test/version_spec.rb
index 9edffeac3..f5ae3cb65 100644
--- a/Library/Homebrew/test/version_spec.rb
+++ b/Library/Homebrew/test/version_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "version"
 
 describe Version do
diff --git a/Library/Homebrew/test/x11_requirement_spec.rb b/Library/Homebrew/test/x11_requirement_spec.rb
index 342394bb3..c4b9ce8dd 100644
--- a/Library/Homebrew/test/x11_requirement_spec.rb
+++ b/Library/Homebrew/test/x11_requirement_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "requirements/x11_requirement"
 
 describe X11Requirement do
diff --git a/Library/Homebrew/unpack_strategy.rb b/Library/Homebrew/unpack_strategy.rb
index 26c61e156..8d56e405e 100644
--- a/Library/Homebrew/unpack_strategy.rb
+++ b/Library/Homebrew/unpack_strategy.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   module Magic
     # length of the longest regex (currently Tar)
diff --git a/Library/Homebrew/unpack_strategy/bazaar.rb b/Library/Homebrew/unpack_strategy/bazaar.rb
index 684a5cad2..fd3d1bd7a 100644
--- a/Library/Homebrew/unpack_strategy/bazaar.rb
+++ b/Library/Homebrew/unpack_strategy/bazaar.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "directory"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/bzip2.rb b/Library/Homebrew/unpack_strategy/bzip2.rb
index 0a8e26925..fd9592d78 100644
--- a/Library/Homebrew/unpack_strategy/bzip2.rb
+++ b/Library/Homebrew/unpack_strategy/bzip2.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Bzip2
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/cab.rb b/Library/Homebrew/unpack_strategy/cab.rb
index f2510d087..9de498ce0 100644
--- a/Library/Homebrew/unpack_strategy/cab.rb
+++ b/Library/Homebrew/unpack_strategy/cab.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Cab
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/compress.rb b/Library/Homebrew/unpack_strategy/compress.rb
index d435b9a59..cf9101f72 100644
--- a/Library/Homebrew/unpack_strategy/compress.rb
+++ b/Library/Homebrew/unpack_strategy/compress.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "tar"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/cvs.rb b/Library/Homebrew/unpack_strategy/cvs.rb
index 4ec2b03c2..7991c674c 100644
--- a/Library/Homebrew/unpack_strategy/cvs.rb
+++ b/Library/Homebrew/unpack_strategy/cvs.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "directory"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/directory.rb b/Library/Homebrew/unpack_strategy/directory.rb
index cbfc75b54..66353f279 100644
--- a/Library/Homebrew/unpack_strategy/directory.rb
+++ b/Library/Homebrew/unpack_strategy/directory.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Directory
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/dmg.rb b/Library/Homebrew/unpack_strategy/dmg.rb
index 6130d9b42..085eec617 100644
--- a/Library/Homebrew/unpack_strategy/dmg.rb
+++ b/Library/Homebrew/unpack_strategy/dmg.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "tempfile"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/executable.rb b/Library/Homebrew/unpack_strategy/executable.rb
index 3378bb6ff..82a84e144 100644
--- a/Library/Homebrew/unpack_strategy/executable.rb
+++ b/Library/Homebrew/unpack_strategy/executable.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "uncompressed"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/fossil.rb b/Library/Homebrew/unpack_strategy/fossil.rb
index 3bcfbd472..6b7a5d931 100644
--- a/Library/Homebrew/unpack_strategy/fossil.rb
+++ b/Library/Homebrew/unpack_strategy/fossil.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Fossil
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/generic_unar.rb b/Library/Homebrew/unpack_strategy/generic_unar.rb
index a0c9fe40d..347dd6ac1 100644
--- a/Library/Homebrew/unpack_strategy/generic_unar.rb
+++ b/Library/Homebrew/unpack_strategy/generic_unar.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class GenericUnar
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/git.rb b/Library/Homebrew/unpack_strategy/git.rb
index 2f5768ca5..4aefb640d 100644
--- a/Library/Homebrew/unpack_strategy/git.rb
+++ b/Library/Homebrew/unpack_strategy/git.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "directory"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/gzip.rb b/Library/Homebrew/unpack_strategy/gzip.rb
index 930fed4ed..5db11be72 100644
--- a/Library/Homebrew/unpack_strategy/gzip.rb
+++ b/Library/Homebrew/unpack_strategy/gzip.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Gzip
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/jar.rb b/Library/Homebrew/unpack_strategy/jar.rb
index 90d4f6485..9827cc62c 100644
--- a/Library/Homebrew/unpack_strategy/jar.rb
+++ b/Library/Homebrew/unpack_strategy/jar.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "uncompressed"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/lha.rb b/Library/Homebrew/unpack_strategy/lha.rb
index 2d92e6554..052701320 100644
--- a/Library/Homebrew/unpack_strategy/lha.rb
+++ b/Library/Homebrew/unpack_strategy/lha.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Lha
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/lua_rock.rb b/Library/Homebrew/unpack_strategy/lua_rock.rb
index fe3d8f130..70759c981 100644
--- a/Library/Homebrew/unpack_strategy/lua_rock.rb
+++ b/Library/Homebrew/unpack_strategy/lua_rock.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "uncompressed"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/lzip.rb b/Library/Homebrew/unpack_strategy/lzip.rb
index 2a6792be1..121dea7a7 100644
--- a/Library/Homebrew/unpack_strategy/lzip.rb
+++ b/Library/Homebrew/unpack_strategy/lzip.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Lzip
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/lzma.rb b/Library/Homebrew/unpack_strategy/lzma.rb
index a611db87d..257fb7598 100644
--- a/Library/Homebrew/unpack_strategy/lzma.rb
+++ b/Library/Homebrew/unpack_strategy/lzma.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Lzma
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/mercurial.rb b/Library/Homebrew/unpack_strategy/mercurial.rb
index 18088954d..4799a5e0c 100644
--- a/Library/Homebrew/unpack_strategy/mercurial.rb
+++ b/Library/Homebrew/unpack_strategy/mercurial.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "directory"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/microsoft_office_xml.rb b/Library/Homebrew/unpack_strategy/microsoft_office_xml.rb
index 50647869e..869c0debb 100644
--- a/Library/Homebrew/unpack_strategy/microsoft_office_xml.rb
+++ b/Library/Homebrew/unpack_strategy/microsoft_office_xml.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "uncompressed"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/otf.rb b/Library/Homebrew/unpack_strategy/otf.rb
index a540f7779..ff4c20662 100644
--- a/Library/Homebrew/unpack_strategy/otf.rb
+++ b/Library/Homebrew/unpack_strategy/otf.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "uncompressed"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/p7zip.rb b/Library/Homebrew/unpack_strategy/p7zip.rb
index 9241d9dc3..6110a275b 100644
--- a/Library/Homebrew/unpack_strategy/p7zip.rb
+++ b/Library/Homebrew/unpack_strategy/p7zip.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class P7Zip
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/pax.rb b/Library/Homebrew/unpack_strategy/pax.rb
index c4194879f..bd1fe0d1e 100644
--- a/Library/Homebrew/unpack_strategy/pax.rb
+++ b/Library/Homebrew/unpack_strategy/pax.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Pax
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/pkg.rb b/Library/Homebrew/unpack_strategy/pkg.rb
index f837d4933..10ae04024 100644
--- a/Library/Homebrew/unpack_strategy/pkg.rb
+++ b/Library/Homebrew/unpack_strategy/pkg.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "uncompressed"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/rar.rb b/Library/Homebrew/unpack_strategy/rar.rb
index 890c04460..64604792a 100644
--- a/Library/Homebrew/unpack_strategy/rar.rb
+++ b/Library/Homebrew/unpack_strategy/rar.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Rar
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/self_extracting_executable.rb b/Library/Homebrew/unpack_strategy/self_extracting_executable.rb
index a502cce54..298070fde 100644
--- a/Library/Homebrew/unpack_strategy/self_extracting_executable.rb
+++ b/Library/Homebrew/unpack_strategy/self_extracting_executable.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "generic_unar"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/sit.rb b/Library/Homebrew/unpack_strategy/sit.rb
index c719de4a0..9f537d64e 100644
--- a/Library/Homebrew/unpack_strategy/sit.rb
+++ b/Library/Homebrew/unpack_strategy/sit.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "generic_unar"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/subversion.rb b/Library/Homebrew/unpack_strategy/subversion.rb
index 0a2f922ba..c9dbfdc64 100644
--- a/Library/Homebrew/unpack_strategy/subversion.rb
+++ b/Library/Homebrew/unpack_strategy/subversion.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "directory"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/tar.rb b/Library/Homebrew/unpack_strategy/tar.rb
index 3ef8fe7b9..70c3198d3 100644
--- a/Library/Homebrew/unpack_strategy/tar.rb
+++ b/Library/Homebrew/unpack_strategy/tar.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Tar
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/ttf.rb b/Library/Homebrew/unpack_strategy/ttf.rb
index e5f0540c0..c3107d659 100644
--- a/Library/Homebrew/unpack_strategy/ttf.rb
+++ b/Library/Homebrew/unpack_strategy/ttf.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "uncompressed"
 
 module UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/uncompressed.rb b/Library/Homebrew/unpack_strategy/uncompressed.rb
index 4ce44acc3..be11b25c2 100644
--- a/Library/Homebrew/unpack_strategy/uncompressed.rb
+++ b/Library/Homebrew/unpack_strategy/uncompressed.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Uncompressed
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/xar.rb b/Library/Homebrew/unpack_strategy/xar.rb
index ada4386d3..29d0e7178 100644
--- a/Library/Homebrew/unpack_strategy/xar.rb
+++ b/Library/Homebrew/unpack_strategy/xar.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Xar
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/xz.rb b/Library/Homebrew/unpack_strategy/xz.rb
index 0ce1a899c..a0ce3fbc1 100644
--- a/Library/Homebrew/unpack_strategy/xz.rb
+++ b/Library/Homebrew/unpack_strategy/xz.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Xz
     include UnpackStrategy
diff --git a/Library/Homebrew/unpack_strategy/zip.rb b/Library/Homebrew/unpack_strategy/zip.rb
index 812419909..f7da62019 100644
--- a/Library/Homebrew/unpack_strategy/zip.rb
+++ b/Library/Homebrew/unpack_strategy/zip.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module UnpackStrategy
   class Zip
     include UnpackStrategy
diff --git a/Library/Homebrew/utils.rb b/Library/Homebrew/utils.rb
index 2305367f8..e68d56178 100644
--- a/Library/Homebrew/utils.rb
+++ b/Library/Homebrew/utils.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "emoji"
 require "utils/analytics"
 require "utils/curl"
@@ -111,8 +113,9 @@ def odeprecated(method, replacement = nil, disable: false, disable_on: nil, call
     break
   end
 
-  message = "Calling #{method} is #{verb}! #{replacement_message}"
+  message = +"Calling #{method} is #{verb}! #{replacement_message}"
   message << tap_message if tap_message
+  message.freeze
 
   if ARGV.homebrew_developer? || disable || Homebrew.raise_deprecation_exceptions?
     exception = MethodDeprecatedError.new(message)
@@ -150,12 +153,12 @@ end
 
 def pretty_duration(s)
   s = s.to_i
-  res = ""
+  res = +""
 
   if s > 59
     m = s / 60
     s %= 60
-    res = "#{m} #{"minute".pluralize(m)}"
+    res = +"#{m} #{"minute".pluralize(m)}"
     return res.freeze if s.zero?
 
     res << " "
diff --git a/Library/Homebrew/utils/analytics.rb b/Library/Homebrew/utils/analytics.rb
index 31174451e..df025a2ca 100644
--- a/Library/Homebrew/utils/analytics.rb
+++ b/Library/Homebrew/utils/analytics.rb
@@ -1,10 +1,12 @@
+# frozen_string_literal: true
+
 require "erb"
 
 module Utils
   module Analytics
     class << self
       def custom_prefix_label
-        "custom-prefix".freeze
+        "custom-prefix"
       end
 
       def clear_os_prefix_ci
diff --git a/Library/Homebrew/utils/bottles.rb b/Library/Homebrew/utils/bottles.rb
index 832b815ff..cb2a789ce 100644
--- a/Library/Homebrew/utils/bottles.rb
+++ b/Library/Homebrew/utils/bottles.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "tab"
 require "extend/ARGV"
 
diff --git a/Library/Homebrew/utils/curl.rb b/Library/Homebrew/utils/curl.rb
index d66fec1dc..d801dce90 100644
--- a/Library/Homebrew/utils/curl.rb
+++ b/Library/Homebrew/utils/curl.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "open3"
 
 def curl_executable
diff --git a/Library/Homebrew/utils/fork.rb b/Library/Homebrew/utils/fork.rb
index a505835de..df67c7cf4 100644
--- a/Library/Homebrew/utils/fork.rb
+++ b/Library/Homebrew/utils/fork.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "fcntl"
 require "socket"
 
diff --git a/Library/Homebrew/utils/formatter.rb b/Library/Homebrew/utils/formatter.rb
index f8d012fb3..9cfb74c8d 100644
--- a/Library/Homebrew/utils/formatter.rb
+++ b/Library/Homebrew/utils/formatter.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "utils/tty"
 
 module Formatter
diff --git a/Library/Homebrew/utils/gems.rb b/Library/Homebrew/utils/gems.rb
index 04beb2c8c..2e86e4f51 100644
--- a/Library/Homebrew/utils/gems.rb
+++ b/Library/Homebrew/utils/gems.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Never `require` anything in this file (except English). It needs to be able to
 # work as the first item in `brew.rb` so we can load gems with Bundler when
 # needed before anything else is loaded (e.g. `json`).
@@ -8,12 +10,12 @@ module Homebrew
   module_function
 
   def ruby_bindir
-    "#{RbConfig::CONFIG["prefix"]}/bin".freeze
+    "#{RbConfig::CONFIG["prefix"]}/bin"
   end
 
   def gem_user_bindir
     require "rubygems"
-    "#{Gem.user_dir}/bin".freeze
+    "#{Gem.user_dir}/bin"
   end
 
   def ohai_if_defined(message)
@@ -88,7 +90,7 @@ module Homebrew
 
     ENV["BUNDLE_GEMFILE"] = "#{ENV["HOMEBREW_LIBRARY"]}/Homebrew/Gemfile"
     @bundle_installed ||= begin
-      bundle = "#{gem_user_bindir}/bundle".freeze
+      bundle = "#{gem_user_bindir}/bundle"
       bundle_check_output = `#{bundle} check 2>&1`
       bundle_check_failed = !$CHILD_STATUS.exitstatus.zero?
 
diff --git a/Library/Homebrew/utils/git.rb b/Library/Homebrew/utils/git.rb
index 875b07dc1..ea479cc79 100644
--- a/Library/Homebrew/utils/git.rb
+++ b/Library/Homebrew/utils/git.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "open3"
 
 module Git
diff --git a/Library/Homebrew/utils/github.rb b/Library/Homebrew/utils/github.rb
index d12aaa069..9a4749bd0 100644
--- a/Library/Homebrew/utils/github.rb
+++ b/Library/Homebrew/utils/github.rb
@@ -1,10 +1,12 @@
+# frozen_string_literal: true
+
 require "uri"
 require "tempfile"
 
 module GitHub
   module_function
 
-  API_URL = "https://api.github.com".freeze
+  API_URL = "https://api.github.com"
 
   CREATE_GIST_SCOPES = ["gist"].freeze
   CREATE_ISSUE_FORK_OR_PR_SCOPES = ["public_repo"].freeze
@@ -12,7 +14,7 @@ module GitHub
   ALL_SCOPES_URL = Formatter.url(
     "https://github.com/settings/tokens/new?scopes=#{ALL_SCOPES.join(",")}&description=Homebrew",
   ).freeze
-  PR_ENV_KEY = "HOMEBREW_NEW_FORMULA_PULL_REQUEST_URL".freeze
+  PR_ENV_KEY = "HOMEBREW_NEW_FORMULA_PULL_REQUEST_URL"
   PR_ENV = ENV[PR_ENV_KEY]
 
   class Error < RuntimeError
diff --git a/Library/Homebrew/utils/inreplace.rb b/Library/Homebrew/utils/inreplace.rb
index 67881953d..3bce563f7 100644
--- a/Library/Homebrew/utils/inreplace.rb
+++ b/Library/Homebrew/utils/inreplace.rb
@@ -1,10 +1,12 @@
+# frozen_string_literal: true
+
 module Utils
   class InreplaceError < RuntimeError
     def initialize(errors)
-      formatted_errors = errors.reduce("inreplace failed\n") do |s, (path, errs)|
+      formatted_errors = errors.reduce(+"inreplace failed\n") do |s, (path, errs)|
         s << "#{path}:\n" << errs.map { |e| "  #{e}\n" }.join
       end
-      super formatted_errors
+      super formatted_errors.freeze
     end
   end
 
diff --git a/Library/Homebrew/utils/link.rb b/Library/Homebrew/utils/link.rb
index a40467334..7c24b13b1 100644
--- a/Library/Homebrew/utils/link.rb
+++ b/Library/Homebrew/utils/link.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Utils
   module Link
     module_function
diff --git a/Library/Homebrew/utils/popen.rb b/Library/Homebrew/utils/popen.rb
index fe8004231..f9d189219 100644
--- a/Library/Homebrew/utils/popen.rb
+++ b/Library/Homebrew/utils/popen.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Utils
   def self.popen_read(*args, **options, &block)
     popen(args, "rb", options, &block)
diff --git a/Library/Homebrew/utils/shell.rb b/Library/Homebrew/utils/shell.rb
index 4444f24d4..abab9eed6 100644
--- a/Library/Homebrew/utils/shell.rb
+++ b/Library/Homebrew/utils/shell.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Utils
   module Shell
     module_function
diff --git a/Library/Homebrew/utils/svn.rb b/Library/Homebrew/utils/svn.rb
index 23c9fe13d..6d5d03885 100644
--- a/Library/Homebrew/utils/svn.rb
+++ b/Library/Homebrew/utils/svn.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Utils
   def self.clear_svn_version_cache
     remove_instance_variable(:@svn) if instance_variable_defined?(:@svn)
diff --git a/Library/Homebrew/utils/tty.rb b/Library/Homebrew/utils/tty.rb
index 6d3558466..76e2867dd 100644
--- a/Library/Homebrew/utils/tty.rb
+++ b/Library/Homebrew/utils/tty.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Tty
   module_function
 
diff --git a/Library/Homebrew/utils/user.rb b/Library/Homebrew/utils/user.rb
index e572a0a8e..cf93d088d 100644
--- a/Library/Homebrew/utils/user.rb
+++ b/Library/Homebrew/utils/user.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "delegate"
 require "etc"
 
diff --git a/Library/Homebrew/version.rb b/Library/Homebrew/version.rb
index e2af0b3b6..b24d34083 100644
--- a/Library/Homebrew/version.rb
+++ b/Library/Homebrew/version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "version/null"
 
 class Version
diff --git a/Library/Homebrew/version/null.rb b/Library/Homebrew/version/null.rb
index b4e480be1..c8731b0a0 100644
--- a/Library/Homebrew/version/null.rb
+++ b/Library/Homebrew/version/null.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Version
   NULL = Class.new do
     include Comparable
@@ -49,7 +51,7 @@ class Version
     alias_method :to_str, :to_s
 
     def inspect
-      "#<Version::NULL>".freeze
+      "#<Version::NULL>"
     end
   end.new.freeze
 end