From: Eric Hodel <drbrain@...7.net>
Date: 2008-10-14T15:43:03+09:00
Subject: Re: 1.9 bug?

On Oct 11, 2008, at 19:41 PM, Roger Pack wrote:
> here's a function
>
>
>      def rubygems_version
>         Gem::RubyGemsVersion if defined? Gem::RubyGemsVersion
>       end
>
> 1.8.6
> irb(main):005:0* rubygems_version
> => "1.3.0"
>
> 1.9
>
> irb(main):001:0>       def rubygems_version
> irb(main):002:1>         Gem::RubyGemsVersion if defined?
> Gem::RubyGemsVersion
> irb(main):003:1>       end
> => nil
>
> hmm.
>
>
> I guess it's because of the way that 1.9 'auto integrates' gems?
>
>  irb19
>>> defined? Gem::RubyGemsVersion
> => nil
>>> require 'rubygems'
> => false
>>> defined? Gem::RubyGemsVersion
> => nil
>>> Gem::RubyGemsVersion
> => "1.3.0"
>>> defined? Gem::RubyGemsVersion
> => "constant"
>
> After this point the rubygems_version method works in 1.9

Something seems to be preventing defined?'s const_missing from being  
handled properly.  I'll look into it.