Frozen IO object causes RuntimeError with inspect and fileno

Ruby Development
1

Issue #9865 has been updated by Tomoyuki C…

Backport changed from 2.0.0: REQUIRED, 2.1: REQUIRED to 2.0.0: REQUIRED,
2.1: DONE

r46151 and r46165 (partially) were backported into ruby_2_1 branch at
r47140.

Bug #9865: frozen IO object causes RuntimeError with inspect and fileno

  • Author: Akira T.
  • Status: Closed
  • Priority: Normal
  • Assignee:
  • Category:
  • Target version:
  • ruby -v: ruby 2.2.0dev (2014-05-27 trunk 46150) [x86_64-linux]
  • Backport: 2.0.0: REQUIRED, 2.1: DONE

IO object を freeze すると、inspect や fileno が RuntimeError になるんですが、
これはよろしくないんじゃないかと思います。

% ./ruby -e 'f = open("."); f.freeze; p f'
-e:1:in `inspect': can't modify frozen File (RuntimeError)
  from -e:1:in `p'
  from -e:1:in `<main>'
% ./ruby -e 'f = open("."); f.freeze; p f.fileno'
-e:1:in `fileno': can't modify frozen File (RuntimeError)
  from -e:1:in `<main>'
% ./ruby -v
ruby 2.2.0dev (2014-05-27 trunk 46150) [x86_64-linux]

あるいは、なにか理由がありましたっけ?