fact: Definition FibonacciImpl := Eval simpl in (projT1 FibonacciImpl').
imports: Fiat.Common.Coq__8_4__8_5__Compat Coq.Sets.Ensembles Coq.ZArith.ZArith Coq.Classes.Morphisms Coq.Classes.SetoidTactics Fiat.Computation Fiat.Computation.SetoidMorphisms Coq.Logic.FunctionalExtensionality