From 30f37872486915174f23083fc70d2699084918e1 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Mon, 16 Sep 2019 10:50:31 +0900
Subject: Raise `ArgumentError` by `aspec` check; ref #4688

This is partial `aspec` check that only checks `MRB_ARGS_NONE()`.
---
 src/class.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/class.c')

diff --git a/src/class.c b/src/class.c
index ac0bb8ede..d037a8abb 100644
--- a/src/class.c
+++ b/src/class.c
@@ -470,6 +470,9 @@ mrb_define_method_id(mrb_state *mrb, struct RClass *c, mrb_sym mid, mrb_func_t f
   int ai = mrb_gc_arena_save(mrb);
 
   MRB_METHOD_FROM_FUNC(m, func);
+  if (aspec == MRB_ARGS_NONE()) {
+    MRB_METHOD_NOARG_SET(m);
+  }
   mrb_define_method_raw(mrb, c, mid, m);
   mrb_gc_arena_restore(mrb, ai);
 }
-- 
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