Ellipsis being used for meta-programming expansion is decades old(used in scheme). Here is a reference: https://docs.racket-lang.org/reference/stx-patterns.html

Ellipsis being used for meta-programming expansion is decades old(used in scheme). Here is a reference: https://docs.racket-lang.org/reference/stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29 https://docs.racket-lang.org/reference/stx-patterns.html#%28...