| // Copyright 2016 Microsoft, Inc. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| author: Brian Terlson <brian.terlson@microsoft.com> |
| esid: sec-async-arrow-function-definitions |
| description: Formal parameters may not contain duplicates |
| info: | |
| # 14.2 Arrow Function Definitions |
| |
| When the production |
| |
| ArrowParameters:CoverParenthesizedExpressionAndArrowParameterList |
| |
| is recognized the following grammar is used to refine the interpretation |
| of CoverParenthesizedExpressionAndArrowParameterList: |
| |
| ArrowFormalParameters[Yield, Await]: |
| (UniqueFormalParameters[?Yield, ?Await]) |
| |
| # 14.1.2 Static Semantics: Early Errors |
| |
| UniqueFormalParameters:FormalParameters |
| |
| - It is a Syntax Error if BoundNames of FormalParameters contains any |
| duplicate elements. |
| negative: |
| phase: parse |
| type: SyntaxError |
| ---*/ |
| |
| $DONOTEVALUATE(); |
| |
| async(a, a) => { } |
