From: matz@... (Yukihiro Matsumoto)
Date: 2004-01-06T22:13:29+09:00
Subject: [ruby-dev:22502] Re: module_function for inherited method

まつもと ゆきひろです

In message "[ruby-dev:22498] module_function for inherited method"
    on 04/01/06, nobu.nakada@nifty.ne.jp <nobu.nakada@nifty.ne.jp> writes:

|なひさんによると
|
|  $ ruby-1.6 -e 'module Foo; module_function :to_s; end'
|
|  $ ruby-1.8 -e 'module Foo; module_function :to_s; end'
|  -e:1: [BUG] undefined method `to_s'; can't happen
|  ruby 1.8.1 (2004-01-06) [i686-linux]
|
|  $ ruby-1.9 -e 'module Foo; module_function :to_s; end'
|  -e:1: [BUG] undefined method `to_s'; can't happen
|  ruby 1.9.0 (2004-01-06) [i686-linux]
|
|だそうです。

なるほど。個人的には以下のような修正の方が好みです。

--- eval.c	2 Jan 2004 16:21:15 -0000	1.624
+++ eval.c	6 Jan 2004 13:13:13 -0000
@@ -7057,2 +7057,3 @@ rb_mod_modfunc(argc, argv, module)
 	    m = RCLASS(m)->super;
+	    if (!m) break;
 	}