Colomban Wendling 5793694134 javascript: Add support for the let keyword
`let` is not yet part of the current ECMAScript standard but is part of
the ECMAScript 6 draft and is supported by Mozilla, and people already
use it in some contexts.

Also, the current ECMAScript standard marks `let` as a "considered
reserved word" (7.6.1.2), so it is already a reserved keyword in strict
mode.

See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let
2014-11-24 03:00:27 +01:00
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