| // Copyright (c) 2011, 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. |
|
|
| /**
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| * @assertion A constant expression is an expression whose value can never
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| * change, and that can be evaluated entirely at compile time.
|
| * A constant expression is one of the following:
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| * . . .
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| * • An expression of one of the forms e1 == e2 or e1 != e2 where e1 and e2 are
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| * constant expressions that evaluate to a numeric, string or boolean value
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| * or to null.
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| * @description Checks that an expression of the form e1 == e2 cannot be used
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| * to initialize a constant variable if e1 does not evaluate to a numeric,
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| * string or boolean value.
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| * @compile-error
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| * @author iefremov
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| */
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|
|
| class A {
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| const A();
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| }
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|
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| final a = const A();
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| const m = (a == 1);
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|
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| main() {
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| try {
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| print(m);
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| } catch (x) {}
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| }
|