go parse

$ PERL6LIB=src perl6 t-parse.pl '1'
=> <1>
 statement => <1>
  simple_stmt => <1>
   expression_stmt => <1>
    expression => <1>
     unary_expr => <1>
      primary_expr => <1>
       operand => <1>
        literal => <1>
         basic_lit => <1>
          int_lit => <1>
           decimal_lit => <1>