exact List.ext' as₁ as₂
case mp
α : Type u_1
as₁ as₂ : List α
⊢ All (as₁.ext'Aux as₂) → as₁ = as₂

case mpr
α : Type u_1
as₁ as₂ : List α
⊢ as₁ = as₂ → All (as₁.ext'Aux as₂)
case mpr
α : Type u_1
as₁ as₂ : List α
⊢ as₁ = as₂ → All (as₁.ext'Aux as₂)