Comment #13 on issue 2222 by [email protected]: Drop the "escaped reserved words as identifiers" compatibility measure
https://code.google.com/p/v8/issues/detail?id=2222

This bug also leads to strange behavior for the case of the `this` keyword specifically:

    $ d8 -e "var this;"
    unnamed:1: SyntaxError: Unexpected token this
    var this;
        ^^^^
    SyntaxError: Unexpected token this

...but

    $ d8 -e "var thi\u0073;"
    unnamed:1: TypeError: Identifier 'this' has already been declared
    var thi\u0073;
    ^
    TypeError: Identifier 'this' has already been declared
        at unnamed:1:1

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