anchor.diff:      | '('..')'
       ;
   
  +COMMENT
  +    :   '/*' .*? '*/' -> skip
  +    ;
  +
  +LINE_COMMENT
  +    :   '#--' ~[\r\n] -> skip
  +    ;
   
   WS : [ \t\n\r]+ -> skip ;
positive.code: 
  prologue_keyword
      :   'Prologue:';
   
  scenario_keyword
  	: 	'Scenario:';
   
  step_keyword
  	: 	'Given' | 'When' | 'Then' | 'And' | 'Revering:';
  
  
negative.code: grammar Gherkins;
  
  
  story
      : feature? prologue? scenario*;
  
  feature
      : feature_keyword title
      ;
  
  
  prologue
      : NEWLINE? prologue_keyword (NEWLINE step)+;
  