def first_nat
import bendtorch-core@0.1.0.0/src/tensor/matmul_PROOF.bend as MatmulPROOFimport Base
1206def first_nat(values: List<&2, U32>) -> Nat:
1207 match values:
1208 case first <> rest:
1209 U32.to_nat(first)
1210 case Nil{}:
1211 0n