[ruby-dev:50294] [Ruby trunk Bug#14006] 2.5.0preview1でWarning.warnを再定義するとSystemStackErrorが発生する
From:
shevegen@...
Date:
2017-10-12 05:01:40 UTC
List:
ruby-dev #50294
Issue #14006 has been updated by shevegen (Robert A. Heiler).
Sorry that I distract, please ignore me :) - that kanji ッ looks like a smiley face!
No wonder matz recognized the "lonely person staring at the ground" syntax. :D
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Bug #14006: 2.5.0preview1でWarning.warnを再定義するとSystemStackErrorが発生する
https://bugs.ruby-lang.org/issues/14006#change-67180
* Author: y-yagi (Yuji Yaginuma)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: ruby 2.5.0preview1 (2017-10-10 trunk 60153) [x86_64-linux]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN
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下記スクリプトを2.5.0.preview1で実行するとSystemStackErrorが発生します。 なお、下記スクリプトはRuby 2.4.1p111ではエラーが発生せず正常に動作します。
~~~ ruby
# warning_test.rb
module Warning
def warn(message)
return if message.match?("warning: possibly useless use of a variable in void context")
super
end
end
@a
~~~
バックトレースは下記の通りです。
~~~
ruby -v warning_test.rb
ruby 2.5.0preview1 (2017-10-10 trunk 60153) [x86_64-linux]
warning_test.rb:9: warning: possibly useless use of a variable in void context
warning_test.rb:2: warning: method redefined; discarding old warn
Traceback (most recent call last):
7580: from warning_test.rb:9:in `<main>'
7579: from warning_test.rb:5:in `warn'
7578: from warning_test.rb:5:in `warn'
7577: from warning_test.rb:5:in `warn'
7576: from warning_test.rb:5:in `warn'
7575: from warning_test.rb:5:in `warn'
7574: from warning_test.rb:5:in `warn'
7573: from warning_test.rb:5:in `warn'
... 7568 levels...
4: from warning_test.rb:5:in `warn'
3: from warning_test.rb:5:in `warn'
2: from warning_test.rb:5:in `warn'
1: from warning_test.rb:5:in `warn'
warning_test.rb:5:in `warn': stack level too deep (SystemStackError)
~~~
なお、再定義の方法を、
~~~ ruby
def Warning.warn(message)
...
end
~~~
のように変更すると、エラーが発生せず正常に動作します。
これは意図的な挙動でしょうか?
--
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