From: Run Paint Run Run <redmine@...>
Date: 2009-06-15T05:24:36+09:00
Subject: [ruby-core:23852] [Bug #1632] ARGF's Iterators Return nill Instead of self

Bug #1632: ARGF's Iterators Return nill Instead of self
http://redmine.ruby-lang.org/issues/show/1632

Author: Run Paint Run Run
Status: Open, Priority: Normal
Category: core
ruby -v: ruby 1.9.2dev (2009-06-14 trunk 23689) [i686-linux]

ARGF#each_char, ARGF#each_byte, ARGF#bytes, and ARGF#chars now return nil when passed a block. On 1.8 they returned self. self is preferable because:

* The documentation for IO#each_char and IO#each_byte promises that self will be returned.
* It allows method chaining.
* It's backward compatiable.

    $ cd /tmp
    $ echo 'a' > file
    $ ruby -ve 'p ARGF.chars {}' file
    ruby 1.9.2dev (2009-06-14 trunk 23689) [i686-linux]
    nil
    $ ruby1.8 -ve 'p ARGF.chars {}' file
    ruby 1.8.7 (2008-08-11 patchlevel 72) [i486-linux]
    ARGF
    $ ruby86 -ve 'p ARGF.each_byte {}' file
    ruby 1.8.6 (2009-03-31 patchlevel 368) [i686-linux]
    ARGF


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