Survival.front0: def of unified-nsga-iii@0.2.2.0
Import: import unified-nsga-iii@0.2.2.0/survival.bend as Survival
Lines 341-346 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=341&end_line=346

import Base

def front0(fronts: List<&2, List<&2, Nat>>) -> List<&2, Nat>:
  match fronts:
    case Nil{}:
      Nil{}
    case h <> t:
      h

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat