anchor.diff:        .seq(string('*/')));
     }
   
  -  /** Defines a token parser that consumes whitespace. */
  +  /** Helper to define a token parser that consumes whitespace. */
     Parser _token(input) {
       var parser = input is Parser ? input :
         input.length == 1 ? char(input) :
  
positive.code:   }
  
    void _keywords() {
      ASSERT = _token('assert');
      BREAK = _token('break');
      CASE = _token('case');
  
negative.code:     WITH = _token('with');
  
      // built-in identifiers
      ABSTRACT = _token('abstract');
      AS = _token('as');
      DYNAMIC = _token('dynamic');
  