Ruby Koans not compatible with Ruby 2.0.0?

Question

After successfully upgrading to Ruby 2.0.0's stable release (yay!) I decided to continue on my Koans Path to Enlightenment. However, when running the rake command within the koans folder, as I normally do, I receive this error:

rake
cd koans
/Users/jordanthornquest/.rvm/rubies/ruby-2.0.0-p0/bin/ruby path_to_enlightenment.rb
/Users/jordanthornquest/programming/ruby-koans/koans/edgecase.rb:399:in `rescue in meditate': uninitialized constant EdgeCase::Sensei::AssertionError (NameError)
    from /Users/jordanthornquest/programming/ruby-koans/koans/edgecase.rb:407:in `meditate'
    from /Users/jordanthornquest/programming/ruby-koans/koans/edgecase.rb:470:in `block in walk'
    from /Users/jordanthornquest/programming/ruby-koans/koans/edgecase.rb:481:in `block (3 levels) in each_step'
    from /Users/jordanthornquest/programming/ruby-koans/koans/edgecase.rb:479:in `each'
    from /Users/jordanthornquest/programming/ruby-koans/koans/edgecase.rb:479:in `block (2 levels) in each_step'
    from /Users/jordanthornquest/programming/ruby-koans/koans/edgecase.rb:478:in `each'
    from /Users/jordanthornquest/programming/ruby-koans/koans/edgecase.rb:478:in `each_with_index'
    from /Users/jordanthornquest/programming/ruby-koans/koans/edgecase.rb:478:in `block in each_step'
    from /Users/jordanthornquest/programming/ruby-koans/koans/edgecase.rb:476:in `catch'
    from /Users/jordanthornquest/programming/ruby-koans/koans/edgecase.rb:476:in `each_step'
    from /Users/jordanthornquest/programming/ruby-koans/koans/edgecase.rb:469:in `walk'
    from /Users/jordanthornquest/programming/ruby-koans/koans/edgecase.rb:491:in `block in <top (required)>'
rake aborted!
Command failed with status (1): [/Users/jordanthornquest/.rvm/rubies/ruby-2...]
/Users/jordanthornquest/programming/ruby-koans/Rakefile:90:in `block in <top (required)>'
/Users/jordanthornquest/.rvm/gems/ruby-2.0.0-p0/bin/ruby_noexec_wrapper:14:in `eval'
/Users/jordanthornquest/.rvm/gems/ruby-2.0.0-p0/bin/ruby_noexec_wrapper:14:in `<main>'
Tasks: TOP => default => walk_the_path

I also installed a fresh new Koans batch from GitHub today, as well, to assure that that wasn't my problem. Neither worked for me! It still runs great with 1.9.3. It may be worth noting that I also installed Ruby 2.0 via RVM. I made sure to update to the latest RVM before doing so.

What seems to be the problem?

Answer 1

There is a pull request to fix this, but it has not been accepted yet: https://github.com/neo/ruby_koans/pull/84

For now, you can edit line 149 of src/edgecase.rb to be:

in_ruby_version("1.9", "2.0") do