anchor.diff:      ;
         
   namedArgument
  -    : parameterName specifier
  +    : parameterName specifier ';'
       ;
       
   parameterName
  
positive.code:     ;
      
  cases 
      : ('case' 'null' block)? ('case' '(' caseCondition ')' block)+ ('else' block)?
      ;
      
  caseCondition
  
negative.code:     ;
  
  namedArguments
      : '{' ((namedArgument) => namedArgument)* varargArguments? '}'
      ;
  
  varargArguments
  