package preface

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Minimal definition using return, map and join.

type 'a t

The type held by the Monad.

val map : ('a -> 'b) -> 'a t -> 'b t

Mapping over from 'a to 'b over 'a t to 'b t.

val join : 'a t t -> 'a t

join remove one level of monadic structure, projecting its bound argument into the outer level.