Check more `MRB_ARGS_NONE()`

The `__id__` method implemented in the C function has `MRB_ARGS_NONE()` specified, but it is also effective in the following cases.

```ruby
p nil.__id__ opts: 1 rescue p :a
p nil.method(:__id__).call 1 rescue p :b
p nil.method(:__id__).call opts: 1 rescue p :c
p nil.method(:__id__).to_proc.call 1 rescue p :d
p nil.method(:__id__).to_proc.call opts: 1 rescue p :e
p nil.method(:__id__).unbind.bind_call nil, 1 rescue p :f
p nil.method(:__id__).unbind.bind_call nil, opts: 1 rescue p :g
p nil.__send__ :__id__, 1 rescue p :h
p nil.__send__ :__id__, opts: 1 rescue p :i
```

After applying this patch, all items will output symbols in the same way as CRuby.

For this purpose, add `MRB_PROC_NOARG` to `struct RProc::flags`.

1 files changed, 6 insertions, 1 deletions

diff --git a/mrbgems/mruby-method/src/method.c b/mrbgems/mruby-method/src/method.c
index b8a55e618..18fcaa03a 100644
--- a/mrbgems/mruby-method/src/method.c
+++ b/mrbgems/mruby-method/src/method.c
@@ -300,7 +300,12 @@ method_search_vm(mrb_state *mrb, struct RClass **cp, mrb_sym mid)
     return NULL;
   if (MRB_METHOD_PROC_P(m))
     return MRB_METHOD_PROC(m);
-  return mrb_proc_new_cfunc(mrb, MRB_METHOD_FUNC(m));
+
+  struct RProc *proc = mrb_proc_new_cfunc(mrb, MRB_METHOD_FUNC(m));
+  if (MRB_METHOD_NOARG_P(m)) {
+    proc->flags |= MRB_PROC_NOARG;
+  }
+  return proc;
 }
 
 static mrb_value