def pop_back_ready
bend-collections-laws-math@1.0.0.0 · src/containers/deque.bend:75
import bend-collections-laws-math@1.0.0.0/src/containers/deque.bend as Deque
import Base
import bend-collections-laws-math@1.0.0.0/src/containers/types/deque.bend as E
75def pop_back_ready(~T: Data, d: Deque<T>) -> Deque<T> & Result<&2, &2, E.Error, T>:
76 match d:
77 case DE{f, Nil{}, nf, nb}:
78 (DE{f, Nil{}, nf, nb}, Fail{E.EmptyDeque{}})
79 case DE{f, Con{x, b}, nf, nb}:
80 (DE{f, b, nf, Nat.sub(nb, 1n)}, Done{x})