Queue.length: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/src/containers/queue.bend as Queue
Lines 13-15 of bend-collections@1.0.0.0/src/containers/queue.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/src/containers/queue.bend&start_line=13&end_line=15

import Base

def length(~T: Data, q: Queue<T>) -> Queue<T> & Nat:
  QU{f, b, +n} = q
  (QU{f, b, n}, n)

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  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@1.0.0.0/src/containers/queue.bend&name=Queue