Array.swap.lo: def of Base
Import: import Base
Lines 2458-2460 of Base/base.bend: https://jend.leeeet.dev/read.txt?path=Base/base.bend&start_line=2458&end_line=2460

import Base

def Array.swap.lo(-T: Type, ys: Array<T>, r: Array<T> & T) -> Array<T> & T:
  (nxs, old) = r
  (ANode{nxs, ys}, old)

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma