Expression rel()
 {
     Token temp = next;
     Expression x = bitwise();
     while (true)
     {
         switch (t)
         {
             case TokenKind.LessThan:
                 move(); x = new LessThan(x, bitwise(), temp.line, temp.col); continue;
             case TokenKind.LessThanOrEqual:
                 move(); x = new LessThanOrEqual(x, bitwise(), temp.line, temp.col); continue;
             case TokenKind.GreaterThan:
                 move(); x = new GreaterThan(x, bitwise(), temp.line, temp.col); continue;
             case TokenKind.GreaterThanOrEqual:
                 move(); x = new GreaterThanOrEqual(x, bitwise(), temp.line, temp.col); continue;
             case TokenKind.Inequality:
                 move(); x = new NotEqual(x, bitwise(), temp.line, temp.col); continue;
             case TokenKind.Equality:
             case TokenKind.Assignment:
                 move(); x = new Equality(x, bitwise(), temp.line, temp.col); continue;
             default:
                 return x;
         }
     }
 }