anchor.diff:  
     expression() =>
       ref(operation) |
  -    ref(expressionItem);
  +    ref(expressionItem) |
  +    failure("Expression Expected");
   
     operation() => ref(
       token,
  
positive.code:     ref(notEqualOperator) |
      ref(bitShiftLeft) |
      ref(bitShiftRight) |
      ref(negate)
    );
  
    callable() =>
  
negative.code:     ref(tryCatchStatement) |
      ref(namespace) |
      ref(classBlock) |
      ref(expressionStatement) |
      failure("Statement Expected")
    );
  
    expressionStatement() => ref(expression);
  