Array.swap.hi: def of Base
Import: import Base
Lines 2462-2464 of Base/base.bend: https://jend.leeeet.dev/read.txt?path=Base/base.bend&start_line=2462&end_line=2464

import Base

def Array.swap.hi(-T: Type, xs: Array<T>, r: Array<T> & T) -> Array<T> & T:
  (nys, old) = r
  (ANode{xs, nys}, 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