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type t
type 'a interface
type protocol = ..
class type obj = object
method reference : bool
method release : unit
method hash : Concepts.Hash.hash
method protocols : protocol list
end
val make : #obj -> t
val into : t -> (protocol -> 'a option) -> 'a interface option
val from : 'a interface -> t
val invoke : 'a interface -> ('a -> 'b) -> 'b
val copy : t -> t option
val equal : t -> t -> bool
val release : t -> unit
val hash : t -> Concepts.Hash.hash
val protocols : t -> protocol list
val require : (t -> 'a interface option) -> t -> ('a interface, Concepts.Condition.condition) result
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