compile (Treetop::Compiler::Predicate)

    # File lib/treetop/compiler/node_classes/predicate.rb, line 4
          def compile(address, builder, parent_expression)
            super
            begin_comment(parent_expression)
            use_vars :result, :start_index
            obtain_new_subexpression_address
            parent_expression.prefixed_expression.compile(subexpression_address, builder)
            builder.if__(subexpression_success?) { when_success }
            builder.else_ { when_failure }
            end_comment(parent_expression)
          end