case inr c2 =>
  exact xs_ih ys_tl c2
α β : Type
inst✝ : DecidableEq α
f g : α → β
v : α
h2 : f v = g v
xs_hd : α
xs_tl : List α
xs_ih : ∀ (ys : List β), v ∈ xs_tl → updateListITE f xs_tl ys v = updateListITE g xs_tl ys v
ys_hd : β
ys_tl : List β
c1 : ¬v = xs_hd
c2 : v ∈ xs_tl
⊢ updateListITE f xs_tl ys_tl v = updateListITE g xs_tl ys_tl v
no goals