Deferred (rose_tree.Rose

val iter : 
  'a t ->
  f:( 'a -> unit Async_kernel.Deferred.t ) ->
  unit Async_kernel.Deferred.t

val map : 
  'a t ->
  f:( 'a -> 'b Async_kernel.Deferred.t ) ->
  'b t Async_kernel.Deferred.t

val fold_map : 
  'a t ->
  init:'b ->
  f:( 'b -> 'a -> 'b Async_kernel.Deferred.t ) ->
  'b t Async_kernel.Deferred.t

val all : 'a Async_kernel.Deferred.t t -> 'a t Async_kernel.Deferred.t

module Or_error : sig ... end