Robert Nystrom
a02d5bb211
Change-Id: I7dafd578cf8da38616ae25e5ce8dbbc7e3213014 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/425185 Reviewed-by: Lasse Nielsen <lrn@google.com> Commit-Queue: Lasse Nielsen <lrn@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com>
60 lines
1.5 KiB
Dart
60 lines
1.5 KiB
Dart
// Copyright (c) 2018, 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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import "package:expect/expect.dart";
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// Test that map literals are constant when evaluated in a const context.
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class C {
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final Object x;
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const C(this.x);
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// Static const.
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static const staticConst = <int, int>{37: 87};
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}
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// Top-level const.
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const topConst = <int, int>{37: 87};
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main() {
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const c0 = const <int, int>{37: 87}; // Explicit const.
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// RHS of const local variable.
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const c1 = <int, int>{37: 87};
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// Inside const expression.
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var c2 = (const [
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<int, int>{37: 87},
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])[0]; // List element.
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var c3 = (const {
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<int, int>{37: 87}: 0,
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}).keys.first; // Map key.
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var c4 = (const {
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0: <int, int>{37: 87},
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}).values.first; // Map value.
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var c5 = (const C(<int, int>{37: 87})).x; // Constructor argument.
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Expect.identical(c0, c1);
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Expect.identical(c0, c2);
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Expect.identical(c0, c3);
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Expect.identical(c0, c4);
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Expect.identical(c0, c5);
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Expect.identical(c0, C.staticConst);
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Expect.identical(c0, topConst);
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// Switch case parenthesized const expression.
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switch (c0) {
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case const (<int, int>{37: 87}):
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break;
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default:
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Expect.fail("Didn't match constant");
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}
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// Annotation argument.
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// (Cannot check that it's const, just that it's accepted).
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@C(<int, int>{37: 87})
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var foo = null;
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foo; // avoid "unused" hints.
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}
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