∀ {X : Type u_1} [t : TopologicalSpace X] {C D : Set X} [inst : Topology.RelCWComplex C D]
  (E : Topology.RelCWComplex.Subcomplex C) (F : Set X) (hF : F = ↑E)
  (J : (n : ℕ) → Set (Topology.RelCWComplex.cell C n)) (hJ : J = E.I), E.copy F hF J hJ = E