List.sort.runs: def of Base
Import: import Base
Lines 1172-1177 of Base/base.bend: https://jend.leeeet.dev/read.txt?path=Base/base.bend&start_line=1172&end_line=1177

import Base

def List.sort.runs(-A: Data, xs: List<&2, A>) -> List<&2, List<&2, A>>:
  match xs:
    case Nil{}:
      Nil{}
    case h <> t:
      [h] <> List.sort.runs(A, t)

Uses (1):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List