LAWS.pdb_first_elem: law of bend-prot@0.1.0.0
Import: import bend-prot@0.1.0.0/LAWS.bend as LAWS
Lines 420-422 of bend-prot@0.1.0.0/LAWS.bend: https://jend.leeeet.dev/read.txt?path=bend-prot@0.1.0.0/LAWS.bend&start_line=420&end_line=422

import Base
import bend-prot@0.1.0.0/pdb.bend as Pdb

# ... and the first atom is nitrogen.
law pdb_first_elem:
  {Pdb.first_elem(Pdb.complex_of(Pdb.parse_pdb(Pdb.demo_text()))) == Some{7} : Maybe<&2, U32>}

Uses (6):
  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/pdb.bend&name=complex_of
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/pdb.bend&name=demo_text
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/pdb.bend&name=first_elem
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/pdb.bend&name=parse_pdb