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Racket shows how, with strong module support, a whole "tower of languages a.k.a. macros" can work reliably. Else not so much.

Also, macros in racket are lexically scoped. Any modern macro system should follow their design, IMHO.

Agreed, and happily sweet.js is very consciously modeled after Racket.

That's the best thing I read this morning and a reason why I'm going to give sweet.js a closer look :)