package monads

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Base signature for collections

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 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.