$ LC_ALL=en_US.iso88591 ruby helloworld.rb 
Parsed

$ LC_ALL=en_US.iso88591 ./bin/jruby helloworld.rb 
UTF8Encoding.java:35:in `length': java.lang.ArrayIndexOutOfBoundsException: -1
    from MultiByteEncoding.java:209:in `strLength'
    from ByteList.java:594:in `lengthEnc'
    from SymbolNode.java:63:in `<init>'
    from RubyParser.java:4231:in `execute'
    from RubyParser.java:1648:in `yyparse'
    from RubyParser.java:1539:in `yyparse'
    from RubyParser.java:5257:in `parse'
    from Parser.java:119:in `parse'
    from Parser.java:100:in `parse'
    from Ruby.java:2750:in `parseFileAndGetAST'
    from Ruby.java:2743:in `parseFileFromMainAndGetAST'
    from Ruby.java:2731:in `parseFileFromMain'
    from Ruby.java:607:in `parseFromMain'
    from Ruby.java:553:in `runFromMain'
    from Main.java:401:in `doRunFromMain'
    from Main.java:296:in `internalRun'
    from Main.java:225:in `run'
    from Main.java:197:in `main'