def internal_range_go_append
import bend-mathlib@0.8.1.0/list.bend as Listimport Base
1980def internal_range_go_append(+n: Nat, -ys: List<&2, Nat>, -acc: List<&2, Nat>) -> {List.range.go(n, List.append(&2, Nat, ys, acc)) == List.append(&2, Nat, List.range.go(n, ys), acc) : List<&2, Nat>}:
1981 match n:
1982 case 0n:
1983 {==}
1984 case 1n+p:
1985 internal_range_go_append(p, p <> ys, acc)