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Write once variables
type 'a t
A ivar is a synchronization variable that can be written only once.
val create : unit -> 'a t
Create a new empty ivar.
val read : 'a t -> 'a fiber
Read the contents of the ivar.
val fill : 'a t -> 'a -> unit fiber
Fill the ivar with the following value. This can only be called once for a given ivar.
val peek : 'a t -> 'a option fiber
Return Some x is fill t x has been called previously.
Some x
fill t x