no goals
α : Type u_1
β : Type u_2
γ : Type ?u.5816
e : Option α ≃ Option β
h : ↑e.symm none = none
⊢ ↑e none = none
simpa using (congr_arg e h).symm
no goals
α : Type u_1
β : Type u_2
γ : Type ?u.5816
e : Option α ≃ Option β
h : ↑e none = none
⊢ ↑e.symm none = none
simpa using (congr_arg e.symm h).symm