Use RB_SPECIAL_CONST_P instead of rb_special_const_p

rb_special_const_p returns a VALUE (Qtrue or Qfalse), so we shouldn't
assume that Qfalse is 0. We should instead use RB_SPECIAL_CONST_P.

1 files changed, 1 insertions, 1 deletions

diff --git a/gc.c b/gc.c
index d598a7deac..df61246d46 100644
--- a/gc.c
+++ b/gc.c
@@ -4398,7 +4398,7 @@ is_live_object(rb_objspace_t *objspace, VALUE ptr)
 static inline int
 is_markable_object(VALUE obj)
 {
-    if (rb_special_const_p(obj)) return FALSE; /* special const is not markable */
+    if (RB_SPECIAL_CONST_P(obj)) return FALSE; /* special const is not markable */
     check_rvalue_consistency(obj);
     return TRUE;
 }