| /* | |
| * 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 Every function includes a formal parameter list, which consists | |
| * of a list of required parameters, followed by any optional parameters. | |
| * The optional parameters may be specified either as a set of named parameters | |
| * or as a list of positional parameters, but not both. | |
| * formalParameterList: | |
| * '(' ')' | | |
| * '('normalFormalParameters(',' optionalFormalParameters)?')' | | |
| * '('optionalFormalParameters')' | |
| * ; | |
| * normalFormalParameters: | |
| * normalFormalParameter(',' normalFormalParameter)* | |
| * ; | |
| * optionalFormalParameters: | |
| * optionalPositionalFormalParameters | | |
| * namedFormalParameters | |
| * ; | |
| * optionalPositionalFormalParameters: | |
| * `['defaultFormalParameter(`,' defaultFormalParameter)*`]' | |
| * ; | |
| * namedFormalParameters: | |
| * `{'defaultNamedParameter(`,' defaultNamedParameter)*`}' | |
| * ; | |
| * @description Checks that optional positional parameters can't precede | |
| * required parameters. | |
| * @compile-error | |
| * @author rodionov | |
| * @reviewer kaigorodov | |
| */ | |
| f([var a], var b) {} | |
| main() { | |
| try { | |
| f(1, 1); | |
| } catch (x) {} | |
| } |