exact i.elim0
case nil
α : Type u
β : Type v
p : α → Prop
f : (a : α) → p a → β
h : ∀ (a : α), a ∈ [] → p a
i : Fin (length (pmap f [] h))
⊢ get (pmap f [] h) i =
    f (get [] (Fin.cast (_ : length (pmap f [] h) = length []) i))
      (_ : p (get [] (Fin.cast (_ : length (pmap f [] h) = length []) i)))
no goals