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

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

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

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

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

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

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

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

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

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

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

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

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

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

main() {}