From d7c29322b8fea584cb8940b9d216b9e11bdf94f9 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Mon, 31 Mar 2014 14:12:47 +0900
Subject: singleton class needs to set __outer__; fixed #1983

---
 src/class.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/class.c b/src/class.c
index a214d7b27..54cf598a3 100644
--- a/src/class.c
+++ b/src/class.c
@@ -982,6 +982,10 @@ mrb_singleton_class(mrb_state *mrb, mrb_value v)
   }
   obj = mrb_basic_ptr(v);
   prepare_singleton_class(mrb, obj);
+  if (mrb->c && mrb->c->ci && mrb->c->ci->target_class) {
+    mrb_obj_iv_set(mrb, (struct RObject*)obj->c, mrb_intern_lit(mrb, "__outer__"),
+                   mrb_obj_value(mrb->c->ci->target_class));
+  }
   return mrb_obj_value(obj->c);
 }
 
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