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.

// @dart=2.9

/*@testedFeatures=inference*/
library test;

class A {}

class B extends A {
  B 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;

  Test(this.member);

  static void test(Test t) {
    /*@ type=Test* */ t?. /*@target=Test.member*/
        member = /*@ typeArgs=B* */ f();

    t?. /*@target=Test.member*/ /*@target=Test.member*/ member ??= /*@ typeArgs=B* */ f();

    t?. /*@target=Test.member*/ /*@target=Test.member*/ member /*@target=B.+*/ += /*@ typeArgs=C* */ f();

    t?. /*@target=Test.member*/ /*@target=Test.member*/ member /*@target=B.**/ *= /*@ typeArgs=B* */ f();

    t?. /*@target=Test.member*/ /*@target=Test.member*/ member /*@target=B.&*/ &= /*@ typeArgs=A* */ f();

    /*@target=B.-*/ --t
        ?. /*@target=Test.member*/ /*@target=Test.member*/ member;

    t?. /*@target=Test.member*/ /*@target=Test.member*/ member /*@target=B.-*/ --;

    var /*@ type=B* */ v1 = /*@ type=Test* */ t?. /*@target=Test.member*/
        member = /*@ typeArgs=B* */ f();

    var /*@ type=B* */ v2 = t
        ?. /*@target=Test.member*/ /*@target=Test.member*/ member ??= /*@ typeArgs=B* */ f();

    var /*@type=B**/ v3 = t
        ?. /*@target=Test.member*/ /*@target=Test.member*/ member /*@target=B.+*/ += /*@ typeArgs=C* */ f();

    var /*@ type=B* */ v4 = t
        ?. /*@target=Test.member*/ /*@target=Test.member*/ member /*@target=B.**/ *= /*@ typeArgs=B* */ f();

    var /*@ type=C* */ v5 = t
        ?. /*@target=Test.member*/ /*@target=Test.member*/ member /*@target=B.&*/ &= /*@ typeArgs=A* */ f();

    var /*@ type=B* */ v6 = /*@target=B.-*/ --t
        ?. /*@target=Test.member*/ /*@target=Test.member*/ member;

    var /*@ type=B* */ v7 = t
        ?. /*@target=Test.member*/ /*@target=Test.member*/ member /*@target=B.-*/ --;
  }
}

main() {}