fact: Definition pack_sigma@{i} {A : Type@{i}} {P : A -> Type@{i}} {p q : A} {x : P p} {y : P q} (e' : Id p q) (e : Id (@Id_rew A p P x q e') y) : Id (p, x) (q, y).
imports: Coq.Program.Tactics Equations.Init Equations.Signature Equations.CoreTactics Equations.Type.Logic Equations.Type.Classes Equations.Type.EqDec