Survival.MRow: type of unified-nsga-iii@0.2.2.0
Import: import unified-nsga-iii@0.2.2.0/survival.bend as Survival
Lines 718-728 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=718&end_line=728

import Base

# Occupied last-front reference. Members stay in original row order.
# `pos` is that row's place in the last front, so a per-pick sort by the
# earliest remaining member restores first-seen ref order (deleting an
# early row can move its ref behind one that started later). `count` is
# the niche histogram, not the member length. Counts live on the bag, so
# a pick does not `List.get` the counts spine.
type MRow is Data:
  MRow{
    pos: Nat
    row: NRow
  }

Uses (2):
  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=NRow