rb_gc_obj_slot_size is banned in this file

Raison d'etre du gc_impl.c is to purge any internal constructs and rely
solely on our public APIs. rb_gc_obj_slot_size is not public.

1 files changed, 2 insertions, 1 deletions

diff --git a/gc_impl.c b/gc_impl.c
index f3c0a40410..c9e24ab610 100644
--- a/gc_impl.c
+++ b/gc_impl.c
@@ -679,7 +679,8 @@ struct rvalue_overhead {
         VALUE value; \
     }; \
 }))
-# define GET_RVALUE_OVERHEAD(obj) ((struct rvalue_overhead *)((uintptr_t)obj + rb_gc_obj_slot_size(obj)))
+size_t rb_gc_impl_obj_slot_size(VALUE obj);
+# define GET_RVALUE_OVERHEAD(obj) ((struct rvalue_overhead *)((uintptr_t)obj + rb_gc_impl_obj_slot_size(obj)))
 #else
 # define RVALUE_OVERHEAD 0
 #endif