Kernel.rand nearly passes the spec

[jstepien]

But it's not private yet.

[timfel]

Is to_int correct here, or should this use convert_type?

[timfel]

Yep, needs to do use convert_type

CRuby 1.9.3 >> class A
CRuby 1.9.3 ?>   end
CRuby 1.9.3 => nil
CRuby 1.9.3 >> rand(A.new)
TypeError: can't convert A into Integer
        from (irb):4:in `rand'
        from (irb):4
        from /home/tim/.rbenv/versions/ruby/bin/irb:12:in `<main>'
CRuby 1.9.3 >> class A
CRuby 1.9.3 ?>   def to_int
CRuby 1.9.3 ?>     10
CRuby 1.9.3 ?>     end
CRuby 1.9.3 ?>   end
CRuby 1.9.3 => nil
CRuby 1.9.3 >> rand(A.new)
CRuby 1.9.3 => 6

[kostya]

example: https://github.com/topazproject/topaz/blob/master/lib-topaz/enumerable.rb#L123

[jstepien]

@kostya @timfel thanks for your comments. I'll return to this pull request once we've got block-less Fixnum#times, which depends on Enumerator. This will allow me to implement and run specs of Random#rand and in turn it will provide Kernel#rand for free.

[jstepien]

Ready for a review, @alex.