Language/Expressions/Assignment/expression_assignment_t02.dart

/*
 * Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 * for details. All rights reserved. Use of this source code is governed by a
 * BSD-style license that can be found in the LICENSE file.
 */
/**
 * @assertion Evaluation of an assignment of the form e1.v = e2 proceeds as
 * follows:
 * The expression e1 is evaluated to an object o1. Then, the expression e2 is
 * evaluated to an object o2. Then, the setter v = is looked up in o1 with
 * respect to the current library. If o1 is an instance of Type but e1 is not a
 * constant type literal, then if v = is a setter that forwards to a static
 * setter, setter lookup fails. Otherwise, the body of v = is executed with its
 * formal parameter bound to o2 and this bound to o1.
 * @description Checks that if evaluation of e1 failed then e2 is not evaluated
 * @author sgrekhov@unipro.ru
 */

import '../../../Utils/expect.dart';

class C {
  C(int val) {
    v = val;
  }
  int? v;

  C operator +(C val) {
    throw new Exception();
    return new C(0);
  }
}

int count = 0;
int e2() =>  count++;


main() {
  C c1 = new C(1);
  C c2 = new C(2);
  try {
    (c1 + c2).v = e2();
  } catch (e) {
  }
  Expect.equals(1, c1. v);
  Expect.equals(0, count);
}