∀ {α : Type u_2} {M : Matroid α} {X : Set α} {e : α},
  e ∈ X →
    autoParam (e ∈ M.E) Matroid.mem_closure_diff_singleton_iff_closure._auto_1 →
      (e ∈ M.closure (X \ {e}) ↔ M.closure (X \ {e}) = M.closure X)