Deque.back_split: def of bend-collections-laws-math@1.0.0.0
Import: import bend-collections-laws-math@1.0.0.0/src/containers/deque.bend as Deque
Lines 44-46 of bend-collections-laws-math@1.0.0.0/src/containers/deque.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-math@1.0.0.0/src/containers/deque.bend&start_line=44&end_line=46

import Base

def back_split(~T: Data, +n: Nat, +half: Nat, r: List<&2, T> & List<&2, T>) -> Deque<T>:
  (keep, moved) = r
  DE{keep, moved, half, Nat.sub(n, half)}

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.sub
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/src/containers/deque.bend&name=Deque