Eager_deferred.Let_syntaxval return : 'a -> 'a Async_kernel.Deferred.tval (>>=) :
'a Async_kernel.Deferred.t ->
('a -> 'b Async_kernel.Deferred.t) ->
'b Async_kernel.Deferred.tval (>>|) :
'a Async_kernel.Deferred.t ->
('a -> 'b) ->
'b Async_kernel.Deferred.tmodule Let_syntax : sig ... end