tor-browser

The Tor Browser
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function-redeclaration-switch.js (1399B)

      1 // Copyright (C) 2019 Adrian Heine. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 /*---
      4 description: In non-strict mode, duplicate LexicallyDeclaredNames in a switch statement's CaseBlock are allowed if they are bound by FunctionDeclarations
      5 esid: sec-switch-duplicates-allowed-static-semantics
      6 es6id: B.3.3.5
      7 flags: [noStrict]
      8 info: |
      9    B.3.3.4 Changes to Block Static Semantics: Early Errors
     10 
     11    For web browser compatibility, that rule is modified with the addition of the **highlighted** text:
     12 
     13    Block: {StatementList}
     14 
     15    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains any duplicate entries, **unless the source code matching this production is not strict mode code and the duplicate entries are only bound by FunctionDeclarations**.
     16 
     17 
     18    B.3.3.5 Changes to switch Statement Static Semantics: Early Errors
     19 
     20    For web browser compatibility, that rule is modified with the addition of the **highlighted** text:
     21 
     22    SwitchStatement: switch ( Expression ) CaseBlock
     23 
     24    It is a Syntax Error if the LexicallyDeclaredNames of CaseBlock contains any duplicate entries, **unless the source code matching this production is not strict mode code and the duplicate entries are only bound by FunctionDeclarations**.
     25 ---*/
     26 
     27 let x
     28 switch (x) {
     29 case 1:
     30  function a() {}
     31 case 2:
     32  function a() {}
     33 }
     34 
     35 reportCompare(0, 0);