match cmp : compare x y with
| .lt | .eq => simp [Ordering.isLE, cmp]
| .gt =>
  apply Or.inr
  rw [←symm, cmp]
  decide
α : Type
inst✝ : Order α
x y : α
⊢ (compare x y).isLE = true ∨ (compare y x).isLE = true
no goals