method transplanting

* proc.c (umethod_bind): allow another form of method transplanting
  from a module via UnboundMethod.  [ruby-core:34267][Feature #4254]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38354 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Dec 13 13:06:27 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* proc.c (umethod_bind): allow another form of method transplanting
+	  from a module via UnboundMethod.  [ruby-core:34267][Feature #4254]
+
 Thu Dec 13 12:07:25 2012  Shugo Maeda  <shugo@ruby-lang.org>
 
 	* include/ruby/ruby.h (RB_UNUSED_VAR): new macro to suppress

proc.c

@@ -1620,7 +1620,8 @@ umethod_bind(VALUE method, VALUE recv)
 
     TypedData_Get_Struct(method, struct METHOD, &method_data_type, data);
 
-    if (data->rclass != CLASS_OF(recv) && !rb_obj_is_kind_of(recv, data->rclass)) {
+    if (!RB_TYPE_P(data->rclass, T_MODULE) &&
+	data->rclass != CLASS_OF(recv) && !rb_obj_is_kind_of(recv, data->rclass)) {
 	if (FL_TEST(data->rclass, FL_SINGLETON)) {
 	    rb_raise(rb_eTypeError,
 		     "singleton method called for a different object");

test/ruby/test_method.rb

@@ -206,6 +206,10 @@ class TestMethod < Test::Unit::TestCase
     def o.bar; end
     m = o.method(:bar).unbind
     assert_raise(TypeError) { m.bind(Object.new) }
+
+    feature4254 = '[ruby-core:34267]'
+    m = M.instance_method(:meth)
+    assert_equal(:meth, m.bind(Object.new).call, feature4254)
   end
 
   def test_define_method