anchor.diff:            { $sequencedArgument.setEndToken($c); }
             (
               pa2=positionalArgument
  -            { if ($pa2.positionalArgument!=null)
  +            { if ($pa2.positionalArgument!=null) {
                     $sequencedArgument.addPositionalArgument($pa2.positionalArgument); 
  -              sequencedArgument.setEndToken(null); }
  +                  sequencedArgument.setEndToken(null); } }
             |
               sa2=spreadArgument
  -            { if ($sa2.positionalArgument!=null)
  +            { if ($sa2.positionalArgument!=null) {
                     $sequencedArgument.addPositionalArgument($sa2.positionalArgument); 
  -              sequencedArgument.setEndToken(null); }
  +                  sequencedArgument.setEndToken(null); } }
             |
               c2=comprehension
  -            { if ($c2.comprehension!=null)
  -                $sequencedArgument.addPositionalArgument($c2.comprehension);
  -              sequencedArgument.setEndToken(null); }
  +            { if ($c2.comprehension!=null) {
  +                  $sequencedArgument.addPositionalArgument($c2.comprehension);
  +                  sequencedArgument.setEndToken(null); } }
             |
               { displayRecognitionError(getTokenNames(), 
                   new MismatchedTokenException(LIDENTIFIER, input)); }
  
positive.code:       { $positionalArgumentList = new PositionalArgumentList($LPAREN); }
        (
          sa=sequencedArgument
          { if ($sa.sequencedArgument!=null) 
                for (PositionalArgument pa: $sa.sequencedArgument.getPositionalArguments())
                    $positionalArgumentList.addPositionalArgument(pa); }
        )?
        RPAREN
        { $positionalArgumentList.setEndToken($RPAREN); }
  
negative.code:         { $expressionList.setEndToken($c); }
          (
            e2=expression 
            { if ($e2.expression!=null) {
                  $expressionList.addExpression($e2.expression);
                  $expressionList.setEndToken(null); } }
          | { displayRecognitionError(getTokenNames(), 
                new MismatchedTokenException(LIDENTIFIER, input)); } //TODO: sometimes it should be RPAREN!
          )
  