Pdb.first_elem_go: def of bend-prot@0.1.0.0
Import: import bend-prot@0.1.0.0/pdb.bend as Pdb
Lines 453-458 of bend-prot@0.1.0.0/pdb.bend: https://jend.leeeet.dev/read.txt?path=bend-prot@0.1.0.0/pdb.bend&start_line=453&end_line=458

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

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

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/protein.bend&name=Atom
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/protein.bend&name=Atom.elem