tor-browser

The Tor Browser
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early-errors-arrow-duplicate-parameters.js (977B)

      1 // |reftest| error:SyntaxError
      2 // Copyright 2016 Microsoft, Inc. All rights reserved.
      3 // This code is governed by the BSD license found in the LICENSE file.
      4 
      5 /*---
      6 author: Brian Terlson <brian.terlson@microsoft.com>
      7 esid: sec-async-arrow-function-definitions
      8 description: Formal parameters may not contain duplicates
      9 info: |
     10  # 14.2 Arrow Function Definitions
     11 
     12  When the production
     13 
     14    ArrowParameters:CoverParenthesizedExpressionAndArrowParameterList
     15 
     16  is recognized the following grammar is used to refine the interpretation
     17  of CoverParenthesizedExpressionAndArrowParameterList:
     18 
     19    ArrowFormalParameters[Yield, Await]:
     20      (UniqueFormalParameters[?Yield, ?Await])
     21 
     22  # 14.1.2 Static Semantics: Early Errors
     23 
     24  UniqueFormalParameters:FormalParameters
     25 
     26  - It is a Syntax Error if BoundNames of FormalParameters contains any
     27    duplicate elements.
     28 negative:
     29  phase: parse
     30  type: SyntaxError
     31 features: [async-functions]
     32 ---*/
     33 
     34 $DONOTEVALUATE();
     35 
     36 async(a, a) => { }