Protein.Atom.pos: def of bend-prot@0.1.0.0
Import: import bend-prot@0.1.0.0/protein.bend as Protein
Lines 18-22 of bend-prot@0.1.0.0/protein.bend: https://jend.leeeet.dev/read.txt?path=bend-prot@0.1.0.0/protein.bend&start_line=18&end_line=22

import Base
import bend-prot@0.1.0.0/geom.bend as G

# Atom position (drops serial/elem, keeps pos)
def Atom.pos(a: Atom) -> G.Vec3:
  match a:
    case Atom{serial, elem, pos}:
      pos

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/geom.bend&name=Vec3
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/protein.bend&name=Atom