| // 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-function-definitions |
| description: Formal parameters may not contain duplicates |
| info: | |
| # 14.7 Arrow Function Definitions |
| |
| AsyncMethod[Yield, Await]: |
| async[no LineTerminator here]PropertyName[?Yield, ?Await](UniqueFormalParameters[~Yield, +Await]){AsyncFunctionBody} |
| |
| # 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(); |
| |
| class Foo { |
| async foo(a, a) { } |
| } |
