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-rw-r--r--internal/class.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/internal/class.h b/internal/class.h
index eade920ff0..da1df196be 100644
--- a/internal/class.h
+++ b/internal/class.h
@@ -92,6 +92,7 @@ typedef struct rb_classext_struct rb_classext_t;
# define RCLASS_SERIAL(c) (RCLASS_EXT(c)->class_serial)
#endif
#define RCLASS_INCLUDER(c) (RCLASS_EXT(c)->includer)
+#define RCLASS_PARENT_SUBCLASSES(c) (RCLASS_EXT(c)->parent_subclasses)
#define RICLASS_IS_ORIGIN FL_USER5
#define RCLASS_CLONED FL_USER6