• mike's avatar
    [parser] Relex restriction on reserved words · d0c65f93
    mike authored
    Some IdentifierNames are only included in the set of FutureReservedWords
    for strict mode code. Outside of strict mode, these IdentifierNames may
    be used as Identifiers. Notably, this includes their use as
    BindingIdentifiers in LexicalBindings.
    
    From ES2015 12.1.1 Static Semantics: Early Errors (Identifiers):
    
    > It is a Syntax Error if this phrase is contained in strict mode code
    > and the StringValue of IdentifierName is: "implements", "interface",
    > "let", "package", "private", "protected", "public", "static", or
    > "yield".
    
    http://www.ecma-international.org/ecma-262/6.0/#sec-identifiers-static-semantics-early-errors
    
    Due to a error in its heuristic for disambiguating the `let` token, V8
    does not currently allow any of the strict-mode-only FutureReservedWords
    to be used as a BindingIdentifier outside of strict mode.
    
    Update V8's heuristic for disambiguating the `let` keyword to account
    for strict mode, enabling these IdentifierNames to be used
    
    BUG=v8:4918
    LOG=N
    R=adamk@chromium.org
    
    Review-Url: https://codereview.chromium.org/1891453005
    Cr-Commit-Position: refs/heads/master@{#36296}
    d0c65f93
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