exact hu'
case a.self.hu
α : Type u_1
n : Nat
x : α
xs : List α
bs : List Bool
pf1 : Nat.succ n < length (x :: xs)
pf2 : Nat.succ n < length (true :: bs)
hnmem : ¬x ∈ xs
hu' : Unique xs
hb : get bs { val := n, isLt := (_ : Nat.succ n ≤ length bs) } = true
⊢ Unique xs
no goals