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The Let_syntax module is intended to be used with the ppx_let pre-processor, and just contains copies of functions described elsewhere.
Let_syntax
ppx_let
val return : 'a -> 'a t
val (>>|) : 'a t -> ('a -> 'b) -> 'b t
val (>>=) : 'a t -> ('a -> 'b t) -> 'b t
module Let_syntax : sig ... end