not jruby compat?

[rdp]

adding
require 'faster_require' to the top of whichr, after
require 'rubygems'
results in:

C:\dev\ruby\faster_rubygems>c:\ruby19\bin\ruby c:\installs\timer.rb whichr whichr
whichr "whichr"
C:/dev/ruby/downloads/jruby/lib/ruby/gems/1.8/gems/faster_require-0.5.2/lib
C:/dev/ruby/downloads/jruby/lib/ruby/site_ruby/1.8
C:/dev/ruby/downloads/jruby/lib/ruby/site_ruby/shared
C:/dev/ruby/downloads/jruby/lib/ruby/1.8
.
enumerator.jar
rubygems.rb
faster_rubygems.rb
C:/dev/ruby/downloads/jruby/lib/ruby/site_ruby/1.8/faster_rubygems/my_gem_prelude.rb
rbconfig.rb
C:/dev/ruby/downloads/jruby/lib/ruby/site_ruby/1.8/faster_rubygems/my_defaults.rb
C:/dev/ruby/downloads/jruby/lib/ruby/site_ruby/1.8/faster_rubygems/prelude_cached_load.rb
C:/dev/ruby/downloads/jruby/lib/ruby/1.8/rubygems.rb
C:/dev/ruby/downloads/jruby/lib/ruby/site_ruby/1.8/faster_rubygems/prelude_bin_path.rb
faster_require.rb
C:/dev/ruby/downloads/jruby/lib/ruby/gems/1.8/gems/sane-0.21.3/lib/sane/test/assertions.rb
C:/dev/ruby/downloads/jruby/lib/ruby/gems/1.8/gems/whichr-0.3.5/bin/whichr:14: undefined method `in?' for "whichr":String (NoMethodError)
        from C:/dev/ruby/downloads/jruby/lib/ruby/gems/1.8/gems/whichr-0.3.5/bin/whichr:20:in`load'
        from C:\dev\ruby\downloads\jruby\bin\whichr:20
1.052316

[rdp]

appears quite broken, indeed

C:\dev>c:\dev\ruby\downloads\jruby\bin\jruby -S rake
"done"
c:/dev/ruby/downloads/jruby/lib/ruby/site_ruby/1.8/rubygems/platform.rb:174 warning: already initialized constant RUBY
c:/dev/ruby/downloads/jruby/lib/ruby/site_ruby/1.8/rubygems/platform.rb:180 warning: already initialized constant CURRENT
Gem::LoadError: Could not find RubyGem rake (>= 0)

  report_activate_error at c:/dev/ruby/downloads/jruby/lib/ruby/site_ruby/1.8/rubygems.rb:863
               activate at c:/dev/ruby/downloads/jruby/lib/ruby/site_ruby/1.8/rubygems.rb:257
                    gem at c:/dev/ruby/downloads/jruby/lib/ruby/site_ruby/1.8/rubygems.rb:1217
                 (root) at c:/dev/ruby/downloads/jruby/bin/rake:18