Toplevel 'let' binding can be left permanently uninitialized after an error

Erik Arvidsson erik.arvidsson at
Tue Sep 30 11:13:05 PDT 2014

On Tue, Sep 30, 2014 at 2:08 PM, Brian Genisio <briangenisio at>

> FYI, you can also see this behavior in Node.js (v0.11.14)
> node --harmony --strict-mode

V8's support of let is far from spec compliant. Stuff under --harmony is
incomplete, buggy and may have security holes. Do not use!

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