fact: Fixpoint Fix2_F x x' (a : Acc R (x, x')) : P (x, x') := F (fun y y' (h : R (y, y') (x, x')) => Fix2_F (Acc_inv a h)).
imports: Fiat.Common.Coq__8_4__8_5__Compat Coq.Setoids.Setoid Coq.Program.Program Coq.Program.Wf Coq.Arith.Wf_nat Coq.Classes.Morphisms Coq.Init.Wf Fiat.Common.Telescope.Core Fiat.Common.Telescope.Instances Fiat.Common.Telescope.Equality Fiat.Common Fiat.Common.Equality Fiat.Common.Wf1