crashy.rb

#!/usr/bin/env ruby

# Why does this crash ruby 1.8.6 in Fedora 11 and 12?  
# It seems to work in 1.8.5 and 1.8.7.

module Frotz
  DICT = {
    'map' => 'MAP'
  }
end

def do_crashy
  result = Crashy.new
  yield result.args if block_given?
  result
end

class Crashy
  attr_reader :args
  def initialize
    @args = arg_struct
  end

  private
  def arg_struct
    @@prototype_args ||= gen_proto_args
    @@prototype_args.clone
  end
  
  def gen_proto_args
    proto_args = []
    
    def proto_args.declare(kind)
      # Any reference to Frotz causes ruby 1.8.6 in Fedora 11 and 12 to segfault
      #  however, "d = ::Frotz::DICT" does not fail
      d = Frotz::DICT  
      kind = d[kind] if d[kind]
      self << [kind]
    end
    
    proto_args
  end
end

cr = do_crashy do |args|
  args.declare "blah"
end

p cr