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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 13c36f7a2c..c8317a51e8 100644
--- a/internal.h
+++ b/internal.h
@@ -63,6 +63,7 @@ VALUE rb_obj_private_methods(int argc, VALUE *argv, VALUE obj);
VALUE rb_obj_public_methods(int argc, VALUE *argv, VALUE obj);
int rb_obj_basic_to_s_p(VALUE);
VALUE rb_special_singleton_class(VALUE);
+VALUE rb_singleton_class_clone_and_attach(VALUE obj, VALUE attach);
void Init_class_hierarchy(void);
/* compile.c */