∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] (J : CategoryTheory.GrothendieckTopology C)
  {D : Type u_2} [inst_1 : CategoryTheory.Category.{v_2, u_2} D] [inst_2 : CategoryTheory.HasWeakSheafify J D]
  {B : Type u_3} [inst_3 : CategoryTheory.Category.{v_3, u_3} B] (U : CategoryTheory.Functor D B)
  [inst_4 : CategoryTheory.HasWeakSheafify J B] [J.PreservesSheafification U] [inst_6 : J.HasSheafCompose U]
  (F : CategoryTheory.Sheaf J D) [h : CategoryTheory.Sheaf.IsConstant J F],
  CategoryTheory.Sheaf.IsConstant J ((CategoryTheory.sheafCompose J U).obj F)