My bad, I mixd it with esprima, on Chrome and Firefox in loose mode, let declaration is not support. so it's syntax error, in esprima, let let = 1 is invalid, but let private = 1 is valid.

"Eric Suen" news:cadsmrny42euuws4akzw4_2qsbng+m_t+ke-y8mh1tauag9z...@mail.gmail.com...

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?

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