From: Run Paint Run Run <redmine@...>
Date: 2009-05-29T06:15:16+09:00
Subject: [ruby-core:23601] [Bug #1533] Inconsistency Between Hash#to_s and Hash#inspect

Bug #1533: Inconsistency Between Hash#to_s and Hash#inspect
http://redmine.ruby-lang.org/issues/show/1533

Author: Run Paint Run Run
Status: Open, Priority: Normal
ruby -v: ruby 1.9.1p129 (2009-05-12 revision 23412) [i686-linux]

There is an inconsistency between Hash#to_s and Hash#inspect with respect to recursive data structures. For example:

    $ ruby -v -e 'x={};x[0]=x;p x.to_s'
    ruby 1.9.1p129 (2009-05-12 revision 23412) [i686-linux]
    "{0=>{0=>{...}}}"
 
    $ ruby -v -e 'x={};x[0]=x;p x.inspect'
    ruby 1.9.1p129 (2009-05-12 revision 23412) [i686-linux]
    "{0=>{...}}"
 
    $ ruby1.8 -v -e 'x={};x[0]=x;p x.to_s'
    ruby 1.8.7 (2008-08-11 patchlevel 72) [i486-linux]
    "0{...}"
 
 
    $ ruby1.8 -v -e 'x={};x[0]=x;p x.inspect'
    ruby 1.8.7 (2008-08-11 patchlevel 72) [i486-linux]
    "{0=>{...}}"

ujihisa noticed that it was caused by a similar issue to the bug he reported in http://redmine.ruby-lang.org/issues/show/1427 . He produced a patch in less time than it took me to type this report, which I have attached. He provides the following demonstration of its result:

    #!./ruby -v
    # ruby 1.9.2dev (2009-05-28 trunk 23601) [i386-darwin9.7.0]
    x = {}
    x[0] = x
    puts x.to_s #=> {0=>{0=>{...}}}
    puts x.inspect #=> {0=>{...}}
 
    # After the patch:
 
    puts x.to_s #=> {0=>{...}}
    puts x.inspect #=> {0=>{...}}

Thanks!


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