strange bundler hanging debug loop

gistfile1.txt

   115          lookup = Hash.new { |h,k| h[k] = [] }
   116          specs = @specs.sort_by do |s|
   117            s.platform.to_s == 'ruby' ? "\0" : s.platform.to_s
   118          end
   119          specs.reverse_each do |s|
=> 120            lookup[s.name] << s
   121          end
   122          lookup
   123        end
   124      end
/Users/markburns/.rbenv/versions/jruby-1.7.0/lib/ruby/gems/shared/gems/bundler-1.2.3/lib/bundler/spec_set.rb:120
lookup[s.name] << s
(rdb:1) s.name
"crack"
(rdb:1) n
[110, 119] in /Users/markburns/.rbenv/versions/jruby-1.7.0/lib/ruby/gems/shared/gems/bundler-1.2.3/lib/bundler/spec_set.rb
   110        @sorted ||= ([rake] + tsort).compact.uniq
   111      end
   112  
   113      def lookup
   114        @lookup ||= begin
=> 115          lookup = Hash.new { |h,k| h[k] = [] }
   116          specs = @specs.sort_by do |s|
   117            s.platform.to_s == 'ruby' ? "\0" : s.platform.to_s
   118          end
   119          specs.reverse_each do |s|