Stack.length: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/src/containers/stack.bend as Stack
Lines 12-14 of bend-collections@1.0.0.0/src/containers/stack.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/src/containers/stack.bend&start_line=12&end_line=14

import Base

def length(~T: Data, s: Stack<T>) -> Stack<T> & Nat:
  ST{xs, +n} = s
  (ST{xs, 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/stack.bend&name=Stack