From: Run Paint Run Run <redmine@...>
Date: 2009-06-01T20:13:49+09:00
Subject: [ruby-core:23657] [Bug #1550] String#lstrip! raises RuntimeError on Frozen String Despite Making No Changes

Bug #1550: String#lstrip! raises RuntimeError on Frozen String Despite Making No Changes
http://redmine.ruby-lang.org/issues/show/1550

Author: Run Paint Run Run
Status: Open, Priority: Normal
ruby -v: ruby 1.9.2dev (2009-05-28 trunk 23601) [i686-linux]

Calling String#lstrip! on a frozen string raises a RuntimeError even if the string was not changed. String#rstrip! doesn't raise an exception in this scenario. I believe that the latter behaviour is correct; #lstrip! should only raise a RuntimeError if the string would be changed.

  $ rubybleed -ve '"ruby".freeze.lstrip!'
  ruby 1.9.2dev (2009-05-28 trunk 23601) [i686-linux]
  -e:1:in `lstrip!': can't modify frozen string (RuntimeError)
  	from -e:1:in `<main>'

  $ rubybleed -ve '"ruby".freeze.rstrip!'
  ruby 1.9.2dev (2009-05-28 trunk 23601) [i686-linux]

1.9.1 behaves the same as 1.9.2. 1.8.7 behaves correctly.


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