class.c: prohibit refinement module

* class.c (ensure_includable): cannot include refinement
  module, or the type and the class do not match.
  [ruby-core:79632] [Bug #13236]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58083 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 0 deletions

diff --git a/class.c b/class.c
index fc99ce4513..d73724bd60 100644
--- a/class.c
+++ b/class.c
@@ -854,6 +854,9 @@ ensure_includable(VALUE klass, VALUE module)
 {
     rb_frozen_class_p(klass);
     Check_Type(module, T_MODULE);
+    if (!NIL_P(rb_refinement_module_get_refined_class(module))) {
+	rb_raise(rb_eArgError, "refinement module is not allowed");
+    }
     OBJ_INFECT(klass, module);
 }