List.filter.put: def of Base
Import: import Base
Lines 1056-1061 of Base/base.bend: https://jend.leeeet.dev/read.txt?path=Base/base.bend&start_line=1056&end_line=1061

import Base

def List.filter.put(-A: Data, h: A, r: List<&2, A>, keep: Bool) -> List<&2, A>:
  match keep:
    case False{}:
      r
    case True{}:
      h <> r

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