JSTests/test262/test/annexB/language/function-code/function-redeclaration-switch.js

// Copyright (C) 2019 Adrian Heine. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
description: In non-strict mode, duplicate LexicallyDeclaredNames in a switch statement's CaseBlock are allowed if they are bound by FunctionDeclarations
esid: sec-switch-duplicates-allowed-static-semantics
es6id: B.3.3.5
flags: [noStrict]
info: |
    B.3.3.4 Changes to Block Static Semantics: Early Errors

    For web browser compatibility, that rule is modified with the addition of the **highlighted** text:

    Block: {StatementList}

    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**.


    B.3.3.5 Changes to switch Statement Static Semantics: Early Errors

    For web browser compatibility, that rule is modified with the addition of the **highlighted** text:

    SwitchStatement: switch ( Expression ) CaseBlock

    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**.
---*/

let x
switch (x) {
case 1:
  function a() {}
case 2:
  function a() {}
}