mirror of
https://github.com/dart-lang/sdk
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58ae856422
Bug: https://github.com/dart-lang/sdk/issues/48004 Change-Id: I61c658f9974fdb2023aa999bf34ee873e348058a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/246301 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
148 lines
3.5 KiB
Dart
148 lines
3.5 KiB
Dart
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Verify semantics of the ?. operator when it appears on the LHS of an
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// assignment.
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import "package:expect/expect.dart";
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import "conditional_access_helper.dart" as h;
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bad() {
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Expect.fail('Should not be executed');
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}
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class B {}
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class C extends B {
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num v;
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C(this.v);
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static late int staticInt;
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}
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class D {
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E v;
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D(this.v);
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static late E staticE;
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}
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class E {
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G operator +(int i) => new I();
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}
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class F {}
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class G extends E implements F {}
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class H {}
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class I extends G implements H {}
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C? nullC() => null;
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main() {
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// e1?.v = e2 is equivalent to ((x) => x == null ? null : x.v = e2)(e1).
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Expect.equals(null, nullC()?.v = bad());
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{
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C? c = new C(1) as dynamic;
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Expect.equals(2, c?.v = 2);
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Expect.equals(2, c!.v);
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}
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// C?.v = e2 is equivalent to C.v = e2.
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C.staticInt = 1;
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Expect.equals(2, C?.staticInt = 2);
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// ^
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// [cfe] The class 'C' cannot be null.
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// ^^
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// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
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Expect.equals(2, C.staticInt);
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h.C.staticInt = 1;
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Expect.equals(2, h.C?.staticInt = 2);
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// ^
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// [cfe] The class 'C' cannot be null.
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// ^^
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// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
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Expect.equals(2, h.C.staticInt);
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// The static type of e1?.v = e2 is the static type of e2.
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{
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D? d = new D(new E()) as dynamic;
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G g = new G();
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F? f = (d?.v = g);
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Expect.identical(f, g);
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}
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{
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D.staticE = new E();
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G g = new G();
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F? f = (D?.staticE = g);
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// ^
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// [cfe] The class 'D' cannot be null.
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// ^^
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// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
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Expect.identical(f, g);
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}
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h.D.staticE = new h.E();
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h.G g = new h.G();
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h.F? f = (h.D?.staticE = g);
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// ^
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// [cfe] The class 'D' cannot be null.
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// ^^
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// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
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Expect.identical(f, g);
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// Exactly the same errors that would be caused by e1.v = e2 are
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// also generated in the case of e1?.v = e2.
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// e1?.v op= e2 is equivalent to ((x) => x?.v = x.v op e2)(e1).
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Expect.equals(null, nullC()?.v += bad());
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{
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C? c = new C(1) as dynamic;
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Expect.equals(3, c?.v += 2);
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Expect.equals(3, c!.v);
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}
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// C?.v op= e2 is equivalent to C.v op= e2.
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C.staticInt = 1;
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Expect.equals(3, C?.staticInt += 2);
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// ^
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// [cfe] The class 'C' cannot be null.
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// ^^
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// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
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Expect.equals(3, C?.staticInt);
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// ^
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// [cfe] The class 'C' cannot be null.
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// ^^
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// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
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// The static type of e1?.v op= e2 is the static type of e1.v op e2.
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{
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D? d = new D(new E()) as dynamic;
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F? f = (d?.v += 1);
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Expect.identical(d!.v, f);
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}
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{
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D.staticE = new E();
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F? f = (D?.staticE += 1);
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// ^
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// [cfe] The class 'D' cannot be null.
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// ^^
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// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
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Expect.identical(D.staticE, f);
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}
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{
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h.D.staticE = new h.E();
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h.F? f = (h.D?.staticE += 1);
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// ^
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// [cfe] The class 'D' cannot be null.
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// ^^
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// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
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Expect.identical(h.D.staticE, f);
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}
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}
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