def le64_at
import bend-osdev-bytes@0.1.1.0/bytes.bend as Bytesimport Base
import bend-osdev-word64@0.1.1.0/word64.bend as W
200def le64_at(+xs: List<&2, U32>, +i: Nat) -> Maybe<&2, W.W64>:
201 le64.join(le32_at(xs, i), le32_at(xs, Nat.add(i, 4n)))