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Infix operators for the state monad
val (^=!) : ('a, 'b) t -> 'b -> 'a -> unit * 'a
Set operator
val (+=!) : ('a, int) t -> int -> 'a -> unit * 'a
val (-=!) : ('a, int) t -> int -> 'a -> unit * 'a
val (@=!) : ('a, 'b list) t -> 'b list -> 'a -> unit * 'a