delegate.rb: keep special methods

* lib/delegate.rb (Delegator): keep source information methods
  which start and end with '__'.  [ruby-core:58572] [Bug #9155]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44630 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 57 insertions, 0 deletions

diff --git a/test/test_delegate.rb b/test/test_delegate.rb
index ca65ef3daa..6270cc61b6 100644
--- a/test/test_delegate.rb
+++ b/test/test_delegate.rb
@@ -180,4 +180,61 @@ class TestDelegateClass < Test::Unit::TestCase
     x = assert_nothing_raised(ArgumentError, bug9155) {break Bug9155.new(1)}
     assert_equal(1, x.to_i, bug9155)
   end
+
+  class Bug9403
+    Name = '[ruby-core:59718] [Bug #9403]'
+    SD = SimpleDelegator.new(new)
+    class << SD
+      def method_name
+        __method__
+      end
+      def callee_name
+        __callee__
+      end
+      alias aliased_name callee_name
+      def dir_name
+        __dir__
+      end
+    end
+    dc = DelegateClass(self)
+    dc.class_eval do
+      def method_name
+        __method__
+      end
+      def callee_name
+        __callee__
+      end
+      alias aliased_name callee_name
+      def dir_name
+        __dir__
+      end
+    end
+    DC = dc.new(new)
+  end
+
+  def test_method_in_simple_delegator
+    assert_equal(:method_name, Bug9403::SD.method_name, Bug9403::Name)
+  end
+
+  def test_callee_in_simple_delegator
+    assert_equal(:callee_name, Bug9403::SD.callee_name, Bug9403::Name)
+    assert_equal(:aliased_name, Bug9403::SD.aliased_name, Bug9403::Name)
+  end
+
+  def test_dir_in_simple_delegator
+    assert_equal(__dir__, Bug9403::SD.dir_name, Bug9403::Name)
+  end
+
+  def test_method_in_delegator_class
+    assert_equal(:method_name, Bug9403::DC.method_name, Bug9403::Name)
+  end
+
+  def test_callee_in_delegator_class
+    assert_equal(:callee_name, Bug9403::DC.callee_name, Bug9403::Name)
+    assert_equal(:aliased_name, Bug9403::DC.aliased_name, Bug9403::Name)
+  end
+
+  def test_dir_in_delegator_class
+    assert_equal(__dir__, Bug9403::DC.dir_name, Bug9403::Name)
+  end
 end