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include Monads.Std.Monad.Collection.Basic
type 'a t

x t a container that hold values of type x

val return : 'a -> 'a t

return x creates a singleton container holding x

include Monads.Std.Monad.Plus.S with type 'a t := 'a t
val zero : unit -> 'a t

zero () constructs a zero element

val plus : 'a t -> 'a t -> 'a t

plus x y an associative operation.

val fold : 'a t -> init:'s -> f:('s -> 'a -> 's) -> 's

fold implementation