Image.free: def of Base
Import: import Base
Lines 3119-3131 of Base/base.bend: https://jend.leeeet.dev/read.txt?path=Base/base.bend&start_line=3119&end_line=3131

import Base

# Forks k levels, then a dead parameter sinks the rest in one loop.
def Image.free(+k: Nat, img: Image) -> Unit:
  match k:
    case 0n:
      Image.sink(img)
    case 1n+e:
      match img:
        case Pix{c}:
          Unit{}
        case Qua{tl, tr, bl, br}:
          a b c d = Image.free(e, tl) Image.free(e, tr) Image.free(e, bl)
            Image.free(e, br)
          Image.drop.join(a, b, c, d)

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Image
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Image.drop.join
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Image.sink
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Unit