intros
α : Type u_1
⊢ ∀ (ix bound : ℕ) (H : ix + List.length [] = bound), List.length [] = List.length (zipFlatIndexGo [] ix bound H)
α : Type u_1
ix✝ bound✝ : ℕ
H✝ : ix✝ + List.length [] = bound✝
⊢ List.length [] = List.length (zipFlatIndexGo [] ix✝ bound✝ H✝)