def first_elem_go

bend-prot@0.1.0.0 · pdb.bend:453

import Base
import bend-prot@0.1.0.0/protein.bend as P

453def first_elem_go(xs: List<&2, P.Atom>) -> Maybe<&2, U32>:
454  match xs:
455    case Nil{}:
456      None{}
457    case h <> t:
458      Some{P.Atom.elem(h)}