Deque.push_back: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/src/containers/deque.bend as Deque
Lines 22-24 of bend-collections@1.0.0.0/src/containers/deque.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/src/containers/deque.bend&start_line=22&end_line=24

import Base

def push_back(~T: Data, d: Deque<T>, x: T) -> Deque<T>:
  DE{f, b, nf, nb} = d
  DE{f, Con{x, b}, nf, 1n+nb}

Uses (3):
  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=bend-collections@1.0.0.0/src/containers/deque.bend&name=Deque