blob: ffeb1fea861de1546d3893e6f5364943ca7dc73a [file] [log] [blame]
// Copyright (c) 2018, 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.
import "package:expect/expect.dart";
// Test that constructor invocations are constant
// when evaluated in a const context.
class C<T> {
final T x;
const C(this.x);
// Static const.
static const staticConst = C<int>(42);
// Top-level const.
const topConst = C<int>(42);
main() {
const c0 = const C<int>(42); // Explicit const.
// RHS of const local variable.
const c1 = C<int>(42);
// Inside const expression.
var c2 = (const [C<int>(42)])[0]; // List element.
var c3 = (const {C<int>(42): 0}).keys.first; // Map key.
var c4 = (const {0: C<int>(42)}).values.first; // Map value.
var c5 = (const C(C<int>(42))).x; // Constructor argument.
Expect.identical(c0, c1);
Expect.identical(c0, c2);
Expect.identical(c0, c3);
Expect.identical(c0, c4);
Expect.identical(c0, c5);
Expect.identical(c0, C.staticConst);
Expect.identical(c0, topConst);
// Switch case expression.
switch (c0) {
case C<int>(42):
default:"Didn't match constant");
// Annotation argument.
// (Cannot check that it's const, just that it's accepted).
var foo = null;
foo; // avoid "unused" hints.