def peek_front_ready
bend-collections-laws-math@1.0.0.0 · src/containers/deque.bend:82
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
82def peek_front_ready(~T: Data, d: Deque<T>) -> Deque<T> & Result<&2, &2, E.Error, T>:
83 match d:
84 case DE{Nil{}, b, nf, nb}:
85 (DE{Nil{}, b, nf, nb}, Fail{E.EmptyDeque{}})
86 case DE{Con{+x, f}, b, nf, nb}:
87 (DE{Con{x, f}, b, nf, nb}, Done{x})