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type state = {branch: string; snapshot: Concepts.Hash.hash}
class type implementation = object
method state : state
method pin : state -> unit
end
type Handle.protocol += Session of implementation
type t = implementation
let make impl = Session (impl :> implementation)
let from handle = Handle.into handle (function Session impl -> Some impl | _ -> None)
let state i = Handle.invoke i (fun o -> o#state)
let pin i state = Handle.invoke i (fun o -> o#pin state)
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