def peek_ready

bend-collections@1.0.0.0 · src/containers/queue.bend:35

import Base
import bend-collections@1.0.0.0/src/containers/types/queue.bend as E

35def peek_ready(~T: Data, q: Queue<T>) -> Queue<T> & Result<&2, &2, E.Error, T>:
36  match q:
37    case QU{Nil{}, b, n}:
38      (QU{Nil{}, b, n}, Fail{E.EmptyQueue{}})
39    case QU{Con{+x, f}, b, n}:
40      (QU{Con{x, f}, b, n}, Done{x})