object.c: singleton class clone

* object.c (rb_obj_clone): attach clone to its singleton class during
  cloning singleton class so that singleton_method_added will be called
  on it.  based on the patch by shiba (satoshi shiba)[Bug #5283] in
  [ruby-dev:44477].  [Bug #5283]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38648 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 14 insertions, 0 deletions

diff --git a/test/ruby/test_class.rb b/test/ruby/test_class.rb
index 47c9d9d99f..ef7d4fa922 100644
--- a/test/ruby/test_class.rb
+++ b/test/ruby/test_class.rb
@@ -336,4 +336,18 @@ class TestClass < Test::Unit::TestCase
       end;
     end
   end
+
+  def test_cloned_singleton_method_added
+    bug5283 = '[ruby-dev:44477]'
+    added = []
+    c = Class.new
+    c.singleton_class.class_eval do
+      define_method(:singleton_method_added) {|mid| added << [self, mid]}
+      def foo; :foo; end
+    end
+    added.clear
+    d = c.clone
+    assert_empty(added.grep(->(k) {c == k[0]}), bug5283)
+    assert_equal(:foo, d.foo)
+  end
 end