Set: pp::colors
  Set: pp::unicode
  Assumed: vector
  Assumed: N0
  Proved: V0
  Assumed: f
  Assumed: m
  Assumed: v1
Error (line: 12, pos: 6) type mismatch at application
    f m v1
Function type:
    Π (n : ℕ), (vector ℤ n) → ℤ
Arguments types:
    m : ℕ
    v1 : vector ℤ (m + 0)
f m (cast (V0 ℤ m) v1) : ℤ