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Lexical redeclarations in block- and switch-statements Background feedback from @anba: In https://tc39.github.io/ecma262/#sec-switch-statement-static-semantics-lexicallydeclarednames, all lexically declared names from the different case clauses are combined. For each case clause, the LexicallyDeclaredNames definition from https://tc39.github.io/ecma262/#sec-block-static-semantics-lexicallydeclarednames applies, which has: ``` StatementListItem : Declaration 1. Return the BoundNames of Declaration. ``` And in https://tc39.github.io/ecma262/#prod-Declaration we've got: ``` Declaration[Yield, Await] : HoistableDeclaration[?Yield, ?Await, ~Default] ``` And in https://tc39.github.io/ecma262/#prod-HoistableDeclaration: ``` HoistableDeclaration[Yield, Await, Default] : FunctionDeclaration[?Yield, ?Await, ?Default] ``` And the BoundNames of a FunctionDeclaration is its BindingIdentifier https://tc39.github.io/ecma262/#sec-function-definitions-static-semantics-boundnames. And there's also B3.3.5 (https://tc39.github.io/ecma262/#sec-switch-duplicates-allowed-static-semantics) which allows duplicate FunctionDeclarations in sloppy mode in switch-statements.
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