Survival.refs_at_seq: def of unified-nsga-iii@0.2.2.0
Import: import unified-nsga-iii@0.2.2.0/survival.bend as Survival
Lines 143-148 of unified-nsga-iii@0.2.2.0/survival.bend: https://jend.leeeet.dev/read.txt?path=unified-nsga-iii@0.2.2.0/survival.bend&start_line=143&end_line=148

import Base
import unified-nsga-iii@0.2.2.0/util.bend as Util

def refs_at_seq(+counts: List<&2, Nat>, +need: Nat, refs: List<&2, Nat>) -> List<&2, Nat>:
  match refs:
    case Nil{}:
      Nil{}
    case +r <> rest:
      keep_nat(r, refs_at_seq(counts, need, rest), Nat.is_eq(Util.get_nat(counts, r), need))

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=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.is_eq
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/survival.bend&name=keep_nat
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/util.bend&name=get_nat