* class.c (rb_class_init_copy): singleton class is disallowed to copy,

  from its definition.  fixed: [ruby-talk:142749]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@8469 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 0 deletions

diff --git a/class.c b/class.c
index 59f608732f..b3cec55065 100644
--- a/class.c
+++ b/class.c
@@ -105,6 +105,9 @@ rb_class_init_copy(clone, orig)
     if (RCLASS(clone)->super != 0) {
 	rb_raise(rb_eTypeError, "already initialized class");
     }
+    if (FL_TEST(orig, FL_SINGLETON)) {
+	rb_raise(rb_eTypeError, "can't copy singleton class");
+    }
     return rb_mod_init_copy(clone, orig);
 }