Pdb.collect_extend: def of bend-prot@0.1.0.0
Import: import bend-prot@0.1.0.0/pdb.bend as Pdb
Lines 331-343 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=331&end_line=343

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

# Collect parsed atoms plus the skipped-line count. Tail-recursive: the
# extend step builds both outcomes as data (no match, no cycle) and the
# single self-call runs on the tail.
def collect_extend(m: Maybe<&1, U32 & Nat & P.Atom>, st: List<&1, U32 & Nat & P.Atom> & Nat) -> List<&1, U32 & Nat & P.Atom> & Nat:
  match m:
    case None{}:
      match st:
        case (as, n):
          (as, 1n+n)
    case Some{x}:
      match st:
        case (as, n):
          (x <> as, n)

Uses (7):
  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=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  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