formula: deprecate installed_prefix and installed_version

Library/Homebrew/compat/formula.rb

@@ -16,6 +16,22 @@ class Formula
 
       super
     end
+
+    def installed_prefix
+      # TODO: deprecate for Homebrew 2.5
+      # odeprecated "Formula#installed_prefix",
+      #             "Formula#latest_installed_prefix (or Formula#any_installed_prefix)"
+      latest_installed_prefix
+    end
+
+    # The currently installed version for this formula. Will raise an exception
+    # if the formula is not installed.
+    # @private
+    def installed_version
+      # TODO: deprecate for Homebrew 2.5
+      # odeprecated "Formula#installed_version"
+      Keg.new(latest_installed_prefix).version
+    end
   end
 
   prepend Compat

Library/Homebrew/formula.rb

@@ -559,13 +559,6 @@ class Formula
     end
   end
 
-  # The currently installed version for this formula. Will raise an exception
-  # if the formula is not installed.
-  # @private
-  def installed_version
-    Keg.new(latest_installed_prefix).version
-  end
-
   # The directory in the cellar that the formula is installed to.
   # This directory points to {#opt_prefix} if it exists and if #{prefix} is not
   # called from within the same formula's {#install} or {#post_install} methods.