cases ys
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 : List β
h1 : v ∈ xs_hd :: xs_tl
⊢ updateListITE f (xs_hd :: xs_tl) ys v = updateListITE g (xs_hd :: xs_tl) ys v
case nil
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
h1 : v ∈ xs_hd :: xs_tl
⊢ updateListITE f (xs_hd :: xs_tl) [] v = updateListITE g (xs_hd :: xs_tl) [] v

case cons
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
h1 : v ∈ xs_hd :: xs_tl
head✝ : β
tail✝ : List β
⊢ updateListITE f (xs_hd :: xs_tl) (head✝ :: tail✝) v = updateListITE g (xs_hd :: xs_tl) (head✝ :: tail✝) v