def p_take_fast

bend-osdev-bytes@0.1.1.0 · PROOF.bend:528

import Base
import bend-osdev-bytes@0.1.1.0/bytes.bend as B

528def p_take_fast(+n: Nat, +xs: List<&2, U32>) -> {B.take(n, xs) == B.take.fast(n, xs) : List<&2, U32>}:
529  Equal.sym(List<&2, U32>, B.take.fast(n, xs), B.take(n, xs),
530    Equal.trans(List<&2, U32>, B.take.fast(n, xs), B.rev_onto(B.rev_onto(B.take(n, xs), Nil{}), Nil{}), B.take(n, xs),
531      Equal.cong(List<&2, U32>, List<&2, U32>, l => B.rev_onto(l, Nil{}), B.take.go(n, xs, Nil{}), B.rev_onto(B.take(n, xs), Nil{}), g_takeu(n, xs, Nil{})),
532      rr_back(B.take(n, xs))))