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-rw-r--r--internal.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index bd7162e76c..c502fe076c 100644
--- a/internal.h
+++ b/internal.h
@@ -1056,6 +1056,7 @@ int rb_singleton_class_internal_p(VALUE sklass);
#define RCLASS_REFINED_CLASS(c) (RCLASS_EXT(c)->refined_class)
#define RCLASS_SERIAL(c) (RCLASS_EXT(c)->class_serial)
+#define RCLASS_CLONED FL_USER6
#define RICLASS_IS_ORIGIN FL_USER5
static inline void