case none
α✝ : Type u_1
a : α✝
⊢ ∀ (x : false = true), ¬get none x = a
α✝ : Type u_1
o : Option α✝
a : α✝
⊢ o = some a ↔ ∃ h, get o h = a
cases o <;> simp
no goals
case none
α✝ : Type u_1
a : α✝
⊢ ∀ (x : false = true), ¬get none x = a
intro.