From: "NAKAMURA, Hiroshi" <nakahiro@...>
Date: 2009-12-09T22:58:21+09:00
Subject: [ruby-core:27115] Re: [Bug #2449] StringIO#ungetc behavior is 	contrary to its spec

Hi,

On Mon, Dec 7, 2009 at 08:02, Yukihiro Matsumoto <matz@ruby-lang.org> wrote:
> Spec has changed for 1.9:
>
> �call-seq:
> � strio.ungetc(string) � -> nil
>
> �Pushes back one character (passed as a parameter) onto *strio*
> �such that a subsequent buffered read will return it. �There is no
> �limitation for multiple pushbacks including pushing back behind the
> �beginning of the buffer string.

Yes.

> 1.8.7 inherits the behavior from 1.9, but spec statement has not been
> updated.

Do you mean this IO change (multiple pushbacks and behind the
beginning) should be backported to 1.8?

0% ruby19 -ve 'r,w = IO.pipe; r.ungetc(?a); p r.getc'
ruby 1.9.2dev (2009-12-08 trunk 26049) [i686-linux]
"a"
0% ruby -ve 'r,w = IO.pipe; r.ungetc(?a); p r.getc'
ruby 1.8.8dev (2009-12-07 revision 25983) [i686-linux]
-e:1:in `ungetc': unread stream (IOError)
	from -e:1
1%

// NaHi