From 4ab0a18c8fb133bc8e6a5646ecf69bcf53b71dbe Mon Sep 17 00:00:00 2001
From: Mike McQuaid <mike@mikemcquaid.com>
Date: Sun, 8 Apr 2018 16:48:50 -0700
Subject: [PATCH] patch: improve nil strip message.

As reported https://github.com/Homebrew/brew/pull/4037#issuecomment-379591755.
---
 Library/Homebrew/patch.rb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Library/Homebrew/patch.rb b/Library/Homebrew/patch.rb
index 77021480c..9150be25e 100644
--- a/Library/Homebrew/patch.rb
+++ b/Library/Homebrew/patch.rb
@@ -17,6 +17,8 @@ module Patch
       else
         ExternalPatch.new(strip, &block)
       end
+    when nil
+      raise ArgumentError, "nil value for strip"
     else
       raise ArgumentError, "unexpected value #{strip.inspect} for strip"
     end