From bdb8607cb7549f8555fed781392231ead86d984b Mon Sep 17 00:00:00 2001
From: shugo <shugo@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 8 Dec 2012 13:35:12 +0000
Subject: * eval.c (top_using): raise a RuntimeError if using is called in a  
 module definition or a method definition.

* test/ruby/test_refinement.rb: related test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38274 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 eval.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'eval.c')

diff --git a/eval.c b/eval.c
index 934037da91..d0dcdddc6b 100644
--- a/eval.c
+++ b/eval.c
@@ -1393,7 +1393,11 @@ static VALUE
 top_using(VALUE self, VALUE module)
 {
     NODE *cref = rb_vm_cref();
+    rb_control_frame_t *prev_cfp = previous_frame(GET_THREAD());
 
+    if (cref->nd_next || (prev_cfp && prev_cfp->me)) {
+	rb_raise(rb_eRuntimeError, "using is permitted only at toplevel");
+    }
     Check_Type(module, T_MODULE);
     rb_using_module(cref, module);
     rb_clear_cache();
-- 
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