| // 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. |
| |
| /** |
| * @assertion Postfix expressions invoke the postfix operators on objects. |
| * postfixExpression: |
| * assignableExpression postfixOperator | |
| * primary (selector* | (‘#’ ( (identifier ‘=’?) | operator))) |
| * ; |
| * postfixOperator: |
| * incrementOperator |
| * ; |
| * selector: |
| * assignableSelector | |
| * arguments |
| * ; |
| * incrementOperator: |
| * '++' | |
| * '--' |
| * ; |
| * A postfix expression is either a primary expression, a function, method or |
| * getter invocation, or an invocation of a postfix operator on an expression e. |
| * @description Checks that trying to use map with postfixOperator causes a |
| * compile error. |
| * `Operator []` of [Map] returns a nullable type, because it returns [null] |
| * when the given argument isn't one of the keys of the map. That's why this is |
| * a compile error here. Operator ?++ is not supported for Maps currently. |
| * @compile-error |
| * @author iarkh |
| */ |
| |
| main() { |
| var a = {1: 1, 2: 2, 3: 3}[1]++; |
| } |
