T#dup (T < Proc) should return T's object

T#dup (T < Proc) returns Proc object (not T) from Ruby 1.9.
[Bug #17545]

1 files changed, 1 insertions, 1 deletions

diff --git a/vm.c b/vm.c
index 8ce8b279d4..634ed15884 100644
--- a/vm.c
+++ b/vm.c
@@ -994,7 +994,7 @@ rb_proc_dup(VALUE self)
     rb_proc_t *src;
 
     GetProcPtr(self, src);
-    procval = proc_create(rb_cProc, &src->block, src->is_from_method, src->is_lambda);
+    procval = proc_create(rb_obj_class(self), &src->block, src->is_from_method, src->is_lambda);
     if (RB_OBJ_SHAREABLE_P(self)) FL_SET_RAW(procval, RUBY_FL_SHAREABLE);
     RB_GC_GUARD(self); /* for: body = rb_proc_dup(body) */
     return procval;