It seems that in JSFiddle running on Firefox, let declaration is disabled. So this cannot explain.
From: [email protected] Date: Wed, 31 Dec 2014 21:36:46 +0000 Subject: Re: Can `let`, `static` and `yield` still be used as Identifier? To: [email protected]; [email protected]; [email protected]; [email protected] let = 1; console.log(let); // 1 var let = 1; console.log(let); // 1 let let = 1; // SyntaxError
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