Encapsulate RCLASS_ATTACHED_OBJECT

Right now the attached object is stored as an instance variable
and all the call sites that either get or set it have to know how it's
stored.

It's preferable to hide this implementation detail behind accessors
so that it is easier to change how it's stored.

1 files changed, 1 insertions, 1 deletions

diff --git a/eval.c b/eval.c
index 4425dcf0c5..e7c2904df4 100644
--- a/eval.c
+++ b/eval.c
@@ -441,7 +441,7 @@ rb_class_modify_check(VALUE klass)
 
         if (FL_TEST(klass, FL_SINGLETON)) {
             desc = "object";
-            klass = rb_ivar_get(klass, id__attached__);
+            klass = RCLASS_ATTACHED_OBJECT(klass);
             if (!SPECIAL_CONST_P(klass)) {
                 switch (BUILTIN_TYPE(klass)) {
                   case T_MODULE: