From 090356ec3b237e75cd4e6213685675fd092e6816 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Thu, 17 Jun 2021 16:35:39 +0900
Subject: variable.c: skip prepended module for constant lookup.

```ruby
module M
  FOO = 'm'
end
class A
  FOO = 'a'
  prepend M
end
class B < A
  def foo
    p FOO
  end
end
B.new.foo  # should print `m` not `a`
```
---
 src/variable.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/variable.c b/src/variable.c
index 646353bfd..e1200bc3d 100644
--- a/src/variable.c
+++ b/src/variable.c
@@ -775,7 +775,7 @@ const_get(mrb_state *mrb, struct RClass *base, mrb_sym sym)
 
 L_RETRY:
   while (c) {
-    if (c->iv) {
+    if (!MRB_FLAG_TEST(c, MRB_FL_CLASS_IS_PREPENDED) && c->iv) {
       if (iv_get(mrb, c->iv, sym, &v))
         return v;
     }
-- 
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