code: function makeStringParser ( s ) {
  				var len = s.length;
  
  				return function () {
  					var result = null;
  
  					if ( message.substr( pos, len ) === s ) {
  						result = s;
  						pos += len;
  					}
  
  					return result;
  				};
  			}
docs: Helpers -- just make parserSyntax out of simpler JS builtin types