From: "U.Nakamura" <usa@...>
Date: 2009-01-20T20:41:44+09:00
Subject: [ruby-dev:37797] [Bug:trunk] Array#zip cannot accept enumerables as arguments.

こんにちは、なかむら(う)です。

In message "[ruby-cvs:28896] Ruby:r21678 (trunk): * array.c (take_items), enum.c (enum_zip): tries to convert to"
    on Jan.20,2009 06:47:50, <nobu@ruby-lang.org> wrote:
> nobu	2009-01-20 06:47:48 +0900 (Tue, 20 Jan 2009)
> 
>   New Revision: 21678
> 
>   http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=21678
> 
>   Log:
>     * array.c (take_items), enum.c (enum_zip): tries to convert to
>       array first.  [ruby-core:21442]

たぶん、arrayへの変換を試し、ダメならeachで回す、というのが意
図だろうと思うのですが、Enumerable#zipは大丈夫ですがArray#zip
がそうなっていません。

Index: array.c
===================================================================
--- array.c	(revision 21699)
+++ array.c	(working copy)
@@ -2209,7 +2209,7 @@ take_i(VALUE val, VALUE *args, int argc,
 static VALUE
 take_items(VALUE obj, long n)
 {
-    VALUE result = to_ary(obj);
+    VALUE result = rb_check_array_type(obj);
     VALUE args[2];
 
     if (!NIL_P(result)) return rb_ary_subseq(result, 0, n);

それでは。
-- 
U.Nakamura <usa@garbagecollect.jp>