Survival.pick_member.by.safe: def of unified-nsga-iii@0.2.2.0
Import: import unified-nsga-iii@0.2.2.0/survival.bend as Survival
Lines 503-508 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=503&end_line=508

import Base

def pick_member.by.safe(+asgs: List<&2, Assignment>, group: List<&2, Nat>, empty_niche: Bool, +fallback: Nat) -> Nat:
  match group:
    case Nil{}:
      fallback
    case g0 <> gs:
      pick_member.by(asgs, {g0 <> gs : List<&2, Nat>}, empty_niche)

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  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=unified-nsga-iii@0.2.2.0/survival.bend&name=Assignment
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/survival.bend&name=pick_member.by