From d3b323cf2f2f71c8f5dc823bd52b1a30c2c6ec91 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Sat, 7 Nov 2015 15:51:00 +0900
Subject: PR #2521 did not work for singleton classes for non-class objects;
 fix #3003

---
 src/variable.c | 32 ++++++++++++++++++++++++++------
 1 file changed, 26 insertions(+), 6 deletions(-)

(limited to 'src/variable.c')

diff --git a/src/variable.c b/src/variable.c
index efe6fad12..fa1389caf 100644
--- a/src/variable.c
+++ b/src/variable.c
@@ -759,17 +759,29 @@ MRB_API mrb_value
 mrb_mod_cv_get(mrb_state *mrb, struct RClass * c, mrb_sym sym)
 {
   struct RClass * cls = c;
+  mrb_value v;
 
   while (c) {
-    if (c->iv) {
-      iv_tbl *t = c->iv;
-      mrb_value v;
-
-      if (iv_get(mrb, t, sym, &v))
-        return v;
+    if (c->iv && iv_get(mrb, c->iv, sym, &v)) {
+      return v;
     }
     c = c->super;
   }
+  if (cls && cls->tt == MRB_TT_SCLASS) {
+    mrb_value klass;
+
+    klass = mrb_obj_iv_get(mrb, (struct RObject *)cls,
+                           mrb_intern_lit(mrb, "__attached__"));
+    c = mrb_class_ptr(klass);
+    if (c->tt == MRB_TT_CLASS) {
+      while (c) {
+        if (c->iv && iv_get(mrb, c->iv, sym, &v)) {
+          return v;
+        }
+        c = c->super;
+      }
+    }
+  }
   mrb_name_error(mrb, sym, "uninitialized class variable %S in %S",
                  mrb_sym2str(mrb, sym), mrb_obj_value(cls));
   /* not reached */
@@ -914,6 +926,14 @@ mrb_vm_const_get(mrb_state *mrb, mrb_sym sym)
     if (c->iv && iv_get(mrb, c->iv, sym, &v)) {
       return v;
     }
+    if (c->tt == MRB_TT_SCLASS) {
+      mrb_value klass;
+      klass = mrb_obj_iv_get(mrb, (struct RObject *)c,
+                             mrb_intern_lit(mrb, "__attached__"));
+      c2 = mrb_class_ptr(klass);
+      if (c2->tt == MRB_TT_CLASS)
+        c = c2;
+    }
     c2 = c;
     for (;;) {
       c2 = mrb_class_outer_module(mrb, c2);
-- 
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