pkg/front_end/testcases/inference/infer_assign_to_property_null_aware.dart

// Copyright (c) 2017, 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.

/*@testedFeatures=inference*/
library test;

class A {}

class B extends A {
  A operator +(C v) => null;
  B operator -(int i) => null;
  B operator *(B v) => null;
  C operator &(A v) => null;
}

class C extends B {}

T f<T>() => null;

class Test {
  B member;

  static void test(Test t) {
    /*@ type=Test* */ /*@target=Object::==*/ t?. /*@target=Test::member*/
        member = /*@ typeArgs=B* */ f();
    t?. /*@target=Test::member*/ member ??= /*@ typeArgs=B* */ f();
    t?. /*@target=Test::member*/ member += /*@ typeArgs=dynamic */ f();
    t?. /*@target=Test::member*/ member *= /*@ typeArgs=dynamic */ f();
    t?. /*@target=Test::member*/ member &= /*@ typeArgs=dynamic */ f();
    --t?. /*@target=Test::member*/ member;
    t?. /*@target=Test::member*/ member--;
    var /*@ type=B* */ v1 =
        /*@ type=Test* */ /*@target=Object::==*/ t?. /*@target=Test::member*/
            member = /*@ typeArgs=B* */ f();
    var /*@ type=B* */ v2 =
        t?. /*@target=Test::member*/ member ??= /*@ typeArgs=B* */ f();
    var /*@ type=B* */ v4 =
        t?. /*@target=Test::member*/ member *= /*@ typeArgs=dynamic */ f();
    var /*@ type=C* */ v5 =
        t?. /*@target=Test::member*/ member &= /*@ typeArgs=dynamic */ f();
    var /*@ type=B* */ v6 = --t?. /*@target=Test::member*/ member;
    var /*@ type=B* */ v7 = t?. /*@target=Test::member*/ member--;
  }
}

main() {}