exact absurd hl <| Nat.not_lt_of_le hl'
case leaf
α : Type u
lt : α → α → Bool
inst✝ : LawfulLTBRel lt
x✝ : Subarray α
i✝ : Nat
y x : Subarray α
i : Nat
hl' : 2 * i + 1 ≥ Subarray.size x
hl : 2 * i + 1 < Subarray.size x
heap_left : IsHeap lt x (2 * i + 1)
⊢ lt x[i] x[2 * i + 1] = false
no goals