Feature #4299: no warning: found = in conditional, should be ==

• Status: Closed
• Assignee: nobu (Nobuyoshi Nakada)
• Target version: 2.6

[znz (Kazuhiro NISHIYAMA)]

=begin
http://d.hatena.ne.jp/nagachika/20110119/ruby_trunk_changes_30595_30603
で知ったのですが、右辺の種類によっては「warning: found = in conditional, should be ==」が出ないことがあるようです。

% ruby-trunk -ve '!=""'
ruby 1.9.3dev (2011-01-20 trunk 30614) [i686-linux]
-e:1: warning: found = in conditional, should be ==
% ruby-trunk -ve '!=1'
ruby 1.9.3dev (2011-01-20 trunk 30614) [i686-linux]
-e:1: warning: found = in conditional, should be ==
% ruby-trunk -ve '!={}'
ruby 1.9.3dev (2011-01-20 trunk 30614) [i686-linux]
% ruby-trunk -ve '!=[]'
ruby 1.9.3dev (2011-01-20 trunk 30614) [i686-linux]
%
=end

[naruse (Yui NARUSE)]

• Status changed from Open to Assigned
• Assignee set to nobu (Nobuyoshi Nakada)

[nahi (Hiroshi Nakamura)]

• Target version set to 1.9.3

[nobu (Nobuyoshi Nakada)]

• Tracker changed from Bug to Feature
• Status changed from Assigned to Feedback

この警告が出るのは、右辺が静的なリテラル(数値と、式展開のない文字列、nil、false、true)であるときだけです。
つまり、実行時に動的に作られるArrayやHashに対して出ないのは意図的なものですが、この条件を拡げるべきだという論点はありうると思います。

[naruse (Yui NARUSE)]

• Target version changed from 1.9.3 to 2.0.0

[ko1 (Koichi Sasada)]

• Target version changed from 2.0.0 to 2.6

放置されているようなので next minor に送っておきます．

[nobu (Nobuyoshi Nakada)]

• Status changed from Feedback to Closed
• % Done changed from 0 to 100

This issue was solved with changeset r37344.
Kazuhiro, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

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parse.y: warn static content assign in cond

• parse.y (assign_in_cond): warn for static content object asignments
  in conditional statements. [ruby-dev:43083] [Feature #4299]