Is let let = 1 a valid statement?

Eric Suen at
Fri Nov 13 06:44:05 UTC 2015

In both Chrome and Firefox,

let FutureReservedWord = expr is invalid, but const | var
FutureReservedWord = expr is valid, is this defined in ES 6 or
historical reason?

let/const both are LexicalDeclaration, why behave differently?

Spket IDE - Development Tool for RIA.

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