From: Akinori MUSHA <knu@...>
Date: 2008-04-17T20:52:17+09:00
Subject: Re: Rails broken with 1.8.7 bc Symbol#to_proc

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At Thu, 17 Apr 2008 19:13:17 +0900,
Ola Bini wrote:
> Not sure if anyone has noticed this, but Rails doesn't startup with
> the 1.8.7-preview. This is because of the native Symbol#to_proc that
> seems to have a slightly different behavior than the Ruby-implemented
> one.

Thank you for the report.  We recognize the problem and will be fixing
it shortly.

http://rubyforge.org/tracker/index.php?func=detail&aid=19551&group_id=426&atid=22040

It would be an option to bring the Rails' code in if the right way to
fix the current implementation were to cost too much.

> Example:
>
> on 1.8.6 this:
> class Symbol
> def to_proc
>   proc { |*args| args.shift.__send__(self, *args) }
> end
> end
>
> p([[proc{ },1]].each(&:call))
>
> Will fail with:
> t1.rb:3:in `__send__': undefined method `call' for
> [#<Proc:0x00000000@t1.rb:7>, 1]:Array (NoMethodError)
>        from t1.rb:3:in `to_proc'
>        from t1.rb:7:in `each'
>        from t1.rb:7
>
> While with 1.8.7-preview this line
> p([[proc{ },1]].each(&:call))
>
> will not fail, but print
> [[1]]
>
> The error Rails gives is related:
> /Users/olabini/workspace/optimize_jruby/vendor/rails/activesupport/lib/active_support/inflector.rb:257:in
> `object_id': wrong number of arguments (1 for 0) (ArgumentError)
>        from

Yes, this behavior reflects the messy argument list handling in Ruby
<=1.8 and we'll have to work it around.

Regards,

--
Akinori MUSHA / http://akinori.org/

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