Robert Nystrom
67618b0542
Change-Id: I4466165b3ce2b79325a29db2a4d40d7f98f86007 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149885 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Nicholas Shahan <nshahan@google.com>
110 lines
1.8 KiB
Dart
110 lines
1.8 KiB
Dart
// TODO(multitest): This was automatically migrated from a multitest and may
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// contain strange or dead code.
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// 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 in a postincrement or
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// preincrement expression (or a postdecrement or predecrement expression).
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import "package:expect/expect.dart";
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import "conditional_access_helper.dart" as h;
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class C {
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int 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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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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// Make sure the "none" test fails if assignment to "?." is not implemented.
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// This makes status files easier to maintain.
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nullC()?.v = 1;
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// e1?.v++ is equivalent to ((x) => x == null ? null : x.v++)(e1).
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// C?.v++ is equivalent to C.v++.
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// The static type of e1?.v++ is the same as the static type of e1.v.
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// e1?.v-- is equivalent to ((x) => x == null ? null : x.v--)(e1).
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// C?.v-- is equivalent to C.v--.
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// The static type of e1?.v-- is the same as the static type of e1.v.
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// ++e1?.v is equivalent to e1?.v += 1.
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// ++C?.v is equivalent to C?.v += 1.
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{ C.staticInt = 1; Expect.equals(2, ++C?.staticInt); Expect.equals(2, C.staticInt); }
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// The static type of ++e1?.v is the same as the static type of e1.v + 1.
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// --e1?.v is equivalent to e1?.v -= 1.
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// --C?.v is equivalent to C?.v -= 1.
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// The static type of --e1?.v is the same as the static type of e1.v - 1.
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}
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