def head
import bend-collections-laws-math@1.0.0.0/spec/math/random/chacha8rand.bend as Chacha8randimport Base
import bend-collections-laws-math@1.0.0.0/src/math/u64.bend as W
180def head(xs: List<&2, W.U64>) -> W.U64:
181 match xs:
182 case Nil{}:
183 W.U64{0, 0}
184 case Con{x, rest}:
185 x