Remove unused method

activesupport/lib/active_support/core_ext/object/instance_variables.rb

@@ -30,35 +30,4 @@ def instance_variable_names
   else
     alias_method :instance_variable_names, :instance_variables
   end
-
-  # Copies the instance variables of +object+ into +self+.
-  #
-  # Instance variable names in the +exclude+ array are ignored. If +object+
-  # responds to <tt>protected_instance_variables</tt> the ones returned are
-  # also ignored. For example, Rails controllers implement that method.
-  #
-  # In both cases strings and symbols are understood, and they have to include
-  # the at sign.
-  #
-  #   class C
-  #     def initialize(x, y, z)
-  #       @x, @y, @z = x, y, z
-  #     end
-  #
-  #     def protected_instance_variables
-  #       %w(@z)
-  #     end
-  #   end
-  #
-  #   a = C.new(0, 1, 2)
-  #   b = C.new(3, 4, 5)
-  #
-  #   a.copy_instance_variables_from(b, [:@y])
-  #   # a is now: @x = 3, @y = 1, @z = 2
-  def copy_instance_variables_from(object, exclude = []) #:nodoc:
-    exclude += object.protected_instance_variables if object.respond_to? :protected_instance_variables
-
-    vars = object.instance_variables.map(&:to_s) - exclude.map(&:to_s)
-    vars.each { |name| instance_variable_set(name, object.instance_variable_get(name)) }
-  end
 end

activesupport/test/core_ext/object_and_class_ext_test.rb

@@ -82,37 +82,6 @@ def test_instance_variable_names
     assert_equal %w(@bar @baz), @source.instance_variable_names.sort
   end
 
-  def test_copy_instance_variables_from_without_explicit_excludes
-    assert_equal [], @dest.instance_variables
-    @dest.copy_instance_variables_from(@source)
-
-    assert_equal %w(@bar @baz), @dest.instance_variables.sort.map(&:to_s)
-    %w(@bar @baz).each do |name|
-      assert_equal @source.instance_variable_get(name).object_id,
-                   @dest.instance_variable_get(name).object_id
-    end
-  end
-
-  def test_copy_instance_variables_from_with_explicit_excludes
-    @dest.copy_instance_variables_from(@source, ['@baz'])
-    assert !@dest.instance_variable_defined?('@baz')
-    assert_equal 'bar', @dest.instance_variable_get('@bar')
-  end
-
-  def test_copy_instance_variables_automatically_excludes_protected_instance_variables
-    @source.instance_variable_set(:@quux, 'quux')
-    class << @source
-      def protected_instance_variables
-        ['@bar', :@quux]
-      end
-    end
-
-    @dest.copy_instance_variables_from(@source)
-    assert !@dest.instance_variable_defined?('@bar')
-    assert !@dest.instance_variable_defined?('@quux')
-    assert_equal 'baz', @dest.instance_variable_get('@baz')
-  end
-
   def test_instance_values
     object = Object.new
     object.instance_variable_set :@a, 1