def internal_reverse_append_go
import bend-mathlib@0.8.1.0/list.bend as Listimport Base
87def internal_reverse_append_go(a, -A: Kind(a), xs: List<a, A>, -ys: List<a, A>, -acc: List<a, A>) -> {List.reverse.go(a, A, List.append(a, A, xs, ys), acc) == List.reverse.go(a, A, ys, List.reverse.go(a, A, xs, acc)) : List<a, A>}:
88 match xs:
89 case Nil{}:
90 {==}
91 case h <> t:
92 internal_reverse_append_go(a, A, t, ys, h <> acc)