lite@LTE-RB ~> irb
1.9.3p125 :001 > require_relative "../file"
LoadError: cannot infer basepath
    from (irb):1:in `require_relative'
    from (irb):1
    from /home/lite/.rvm/rubies/ruby-1.9.3-p125-perf/bin/irb:16:in `<main>'
1.9.3p125 :002 > 

rubinius-2.0.0dev :001 > require_relative "../file"
TypeError: Coercion error: nil.to_str => String failed
    from kernel/common/type.rb:28:in `execute_coerce_to'
    from kernel/common/type.rb:21:in `coerce_to'
    from kernel/common/kernel.rb:28:in `StringValue'
    from kernel/common/type19.rb:42:in `coerce_to_path'
    from kernel/common/file.rb:325:in `dirname'
    from kernel/common/codeloader19.rb:26:in `require_relative'
    from kernel/common/kernel19.rb:176:in `require_relative'
    from (irb):1
    from kernel/common/block_environment.rb:75:in `call_on_instance'
    from kernel/common/eval.rb:72:in `eval'
    from kernel/common/kernel19.rb:42:in `loop'
    from kernel/common/throw_catch19.rb:8:in `catch'
    from kernel/common/throw_catch.rb:10:in `register'
    from kernel/common/throw_catch19.rb:7:in `catch'
    from kernel/common/throw_catch19.rb:8:in `catch'
    from kernel/common/throw_catch.rb:10:in `register'
    from kernel/common/throw_catch19.rb:7:in `catch'
    from kernel/common/codeloader.rb:207:in `require'
    from kernel/common/kernel.rb:631:in `gem_original_require (require)'
    from /home/lite/.rvm/rubies/rbx-head/lib/rubygems/custom_require.rb:36:in `require'
    from kernel/loader.rb:706:in `irb'
    from kernel/loader.rb:845:in `main'rubinius-2.0.0dev :002 >

rubinius-2.0.0dev :001 > require_relative "../file"
LoadError: cannot infer basepath from (irb)
    from kernel/common/codeloader19.rb:26:in `require_relative'
    from kernel/common/kernel19.rb:176:in `require_relative'
    from (irb):1
    from kernel/common/block_environment.rb:75:in `call_on_instance'
    from kernel/common/eval.rb:72:in `eval'
    from kernel/common/kernel19.rb:42:in `loop'
    from kernel/common/throw_catch19.rb:8:in `catch'
    from kernel/common/throw_catch.rb:10:in `register'
    from kernel/common/throw_catch19.rb:7:in `catch'
    from kernel/common/throw_catch19.rb:8:in `catch'
    from kernel/common/throw_catch.rb:10:in `register'
    from kernel/common/throw_catch19.rb:7:in `catch'
    from kernel/delta/codeloader.rb:67:in `load_script'
    from kernel/delta/codeloader.rb:109:in `load_script'
    from kernel/loader.rb:632:in `script'
    from kernel/loader.rb:835:in `main'