[Webkit-unassigned] [Bug 185156] JavaScriptCore should throw SyntaxError when a variable is already declared inside the "with" scope

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=185156

--- Comment #1 from Saam Barati <sbarati at apple.com> ---
This is surprising given:

if (b) {
    var a;
    let a;
}

Is not a syntax error. Since with scopes don't require a block as their statement, e.g
```with({}) 20;```
is valid, I would guess this might be a bug in those other engines.

Can you point me to where the spec says this should be a syntax error?

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