From: "nobu (Nobuyoshi Nakada)" <nobu@ruby-lang.org>
To: ruby-core@ruby-lang.org
Subject: [ruby-core:54469] [ruby-trunk - Bug #8297] extend & inherited class variable issue
Date: Fri, 19 Apr 2013 23:53:19 +0900 [thread overview]
Message-ID: <redmine.journal-38757.20130419235318@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-8297.20130419210206@ruby-lang.org
Issue #8297 has been updated by nobu (Nobuyoshi Nakada).
Description updated
----------------------------------------
Bug #8297: extend & inherited class variable issue
https://bugs.ruby-lang.org/issues/8297#change-38757
Author: dunric (David Unric)
Status: Open
Priority: Normal
Assignee:
Category: core
Target version:
ruby -v: 2.0.0p0
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN
=begin
By the current documentation, (({Object#extend})) method has to (only) add instance methods of a module given as a parameter.
In the following example, the class ((|C|)) is extended with module ((|M|)).
By (({class_variables})) method sent to singleton class of C also did inherit class variable ((|@@xyz|)).
However when inherited ((|@@xyz|)) is accessed, (({NameError})) exception is raised as it is was not initialized.
module M
@@xyz = 123
end
M.class_variables # [:@@xyz]
M.class_variable_get :@@xyz # 123 , so far so good
class C
extend M
end
p C.singleton_class.class_variables # [:@@xyz]
p C.singleton_class.class_variable_get :@@xyz # NameError exception
Either (({class_variables})) returns invalid array - ie. ((|@@xyz|)) was not inherited at all or (({class_variable_get})) ignores class variables inherited from module (when sent to a singleton).
=end
Prior Ruby versions like 1.9.3p392 does not suffer this issue as return with Module#class_variables returns an empty array.
--
http://bugs.ruby-lang.org/
next prev parent reply other threads:[~2013-04-19 15:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-19 12:02 [ruby-core:54463] [ruby-trunk - Bug #8297][Open] extend & inherited class variable issue dunric (David Unric)
2013-04-19 12:12 ` [ruby-core:54464] [ruby-trunk - Bug #8297] " dunric (David Unric)
2013-04-19 14:53 ` nobu (Nobuyoshi Nakada) [this message]
2019-01-14 17:37 ` [ruby-core:91085] [Ruby trunk Bug#8297] " justin
2019-08-10 4:33 ` [ruby-core:94242] [Ruby master " merch-redmine
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