Requirement: env DSL is evaluated in context of self, not ENV

This was meant to support:

  env do |req|
    append_path 'PATH', req.some_method
    ...
  end

i.e., the block was evaluated in the context of ENV. But it turned out
to be not so useful after all, so I'm ripping it out before something
actually depends on it.

Library/Homebrew/build_environment.rb

@@ -22,8 +22,8 @@ class BuildEnvironment
     @settings.include? :userpaths
   end
 
-  def modify_build_environment(context=nil)
-    @procs.each { |p| ENV.instance_exec(context, &p) }
+  def modify_build_environment(receiver)
+    @procs.each { |p| receiver.instance_eval(&p) }
   end
 
   def _dump(*)

Library/Homebrew/extend/object.rb

@@ -1,15 +0,0 @@
-class Object
-  def instance_exec(*args, &block)
-    method_name = :__temp_instance_exec_method
-    singleton_class = (class << self; self; end)
-    singleton_class.class_eval do
-      define_method(method_name, &block)
-    end
-
-    send(method_name, *args)
-  ensure
-    singleton_class.class_eval do
-      remove_method(method_name) if method_defined?(method_name)
-    end
-  end unless method_defined?(:instance_exec)
-end

Library/Homebrew/global.rb

@@ -3,7 +3,6 @@ require 'extend/pathname'
 require 'extend/ARGV'
 require 'extend/string'
 require 'extend/symbol'
-require 'extend/object'
 require 'utils'
 require 'exceptions'
 require 'set'

Library/Homebrew/requirement.rb

@@ -68,7 +68,7 @@ class Requirement
     when Pathname
       self.class.env do
         unless ENV["PATH"].split(":").include?(o.parent.to_s)
-          append("PATH", o.parent, ":")
+          ENV.append("PATH", o.parent, ":")
         end
       end
     end

Library/Homebrew/requirements.rb

@@ -179,11 +179,11 @@ class MPIDependency < Requirement
     @unknown_langs.empty? and @non_functional.empty?
   end
 
-  env do |req|
+  env do
     # Set environment variables to help configure scripts find MPI compilers.
     # Variable names taken from:
     # http://www.gnu.org/software/autoconf-archive/ax_mpi.html
-    req.lang_list.each do |lang|
+    @lang_list.each do |lang|
       compiler = 'mpi' + lang.to_s
       mpi_path = which compiler
 

Library/Homebrew/test/test_build_environment.rb

@@ -23,7 +23,7 @@ class BuildEnvironmentTests < Test::Unit::TestCase
   def test_modify_build_environment
     @env << Proc.new { raise StandardError }
     assert_raises(StandardError) do
-      @env.modify_build_environment
+      @env.modify_build_environment(self)
     end
   end
 
@@ -38,7 +38,7 @@ class BuildEnvironmentTests < Test::Unit::TestCase
     foo = mock("foo")
     @env << Proc.new { foo.some_message }
     foo.expects(:some_message)
-    @env.modify_build_environment
+    @env.modify_build_environment(self)
   end
 
   def test_env_block_with_argument

Library/Homebrew/test/test_object.rb

@@ -1,20 +0,0 @@
-require 'testing_env'
-require 'extend/object'
-
-class InstanceExecTests < Test::Unit::TestCase
-  def test_evaluates_in_context_of_receiver
-    assert_equal 1, [1].instance_exec { first }
-  end
-
-  def test_passes_arguments_to_block
-    assert_equal 2, [1].instance_exec(1) { |x| first + x }
-  end
-
-  def test_does_not_persist_temporary_singleton_method
-    obj = Object.new
-    before = obj.methods
-    obj.instance_exec { methods }
-    after = obj.methods
-    assert_equal before, after
-  end
-end