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class type implementation = object
method invoke : Handle.t -> (Handle.t, Concepts.Condition.condition) result
end
type Handle.protocol += Evaluator of implementation
type t = implementation
let make impl = Evaluator (impl :> implementation)
let from handle = Handle.into handle (function Evaluator impl -> Some impl | _ -> None)
let require = Handle.require from
let invoke i program = Handle.invoke i (fun o -> o#invoke program)
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