First.Let_syntax
val return : 'a -> ('a, 'b) t
include Base__.Monad_intf.Infix2 with type ('a, 'e) t := ('a, 'b) t
val (>>=) : ('a, 'b) t -> ('a -> ('a, 'b) t) -> ('a, 'b) t
val (>>|) : ('a, 'b) t -> ('a -> 'b) -> ('a, 'b) t
module Let_syntax : sig ... end