Class vars defined in frozen module are modifiable when module is included
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Key: JRUBY-1364
URL: http://jira.codehaus.org/browse/JRUBY-1364
Project: JRuby
Issue Type: Bug
Reporter: Bill Dortch
Assignee: Thomas E Enebo
Priority: Minor
I hesitate to file this as a bug, since JRuby's behavior matches MRI's, but I
think both are wrong:
{noformat}
>> module M
>> @@cvar = 1
>> def self.inc
>> @@cvar += 1
>> end
>> end
=> nil
>> M.inc
=> 2
>> M.freeze #=> freezing module here
=> M
>> M.inc
TypeError: can't modify frozen class/module#<Class:01x1a70b8>
from (irb):9:in `binding'
>> class C
>> include M
>> def inc
>> @@cvar += 1
>> end
>> end
=> nil
>> C.new.inc
=> 3
>> C.new.inc
=> 4
>> C.freeze
=> C
>> C.new.inc
=> 5
>> M.send :class_variable_get, :@@cvar
=> 5
{noformat}
In JRuby, this happens because {{isFrozen()}} is called on the
{{IncludedModuleWrapper}}, which does not pass the call through to the delegate
(wrapped module). I suspect MRI code does something similar.
So, is this "correct" behavior? Fix or leave as is?
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