1 files changed, 8 insertions, 0 deletions
diff --git a/intern.h b/intern.h
index 8a2916061b..92d41910a5 100644
--- a/intern.h
+++ b/intern.h
@@ -128,6 +128,14 @@ VALUE rb_singleton_class _((VALUE));
 int rb_cmpint _((VALUE, VALUE, VALUE));
 NORETURN(void rb_cmperr _((VALUE, VALUE)));
 /* enum.c */
+VALUE rb_block_call _((VALUE, ID, int, VALUE*, VALUE (*)(ANYARGS), VALUE));
+/* enumerator.c */
+VALUE rb_enumeratorize _((VALUE, VALUE, int, VALUE *));
+#define RETURN_ENUMERATOR(obj, argc, argv) do {				\
+	if (!rb_block_given_p())					\
+	    return rb_enumeratorize(obj, ID2SYM(rb_frame_last_func()),	\
+				    argc, argv);			\
+    } while (0)
 /* error.c */
 RUBY_EXTERN int ruby_nerrs;
 VALUE rb_exc_new _((VALUE, const char*, long));