∀ {G : Type u_1} [inst : CategoryTheory.Groupoid G] [inst_1 : IsFreeGroupoid G]
  (T : WideSubquiver (Quiver.Symmetrify (IsFreeGroupoid.Generators G)))
  [inst_2 : Quiver.Arborescence (WideSubquiver.toType (Quiver.Symmetrify (IsFreeGroupoid.Generators G)) T)] {b : G},
  CategoryTheory.IsIso (IsFreeGroupoid.SpanningTree.treeHom T b)