message: This coercion doesn't take place on stable yet.
diff: @@ -108,7 +108,7 @@ impl<G: CurveProjective> Wnaf<(), Vec<G>, Vec<i64>> {
  // Return a Wnaf object that immutably borrows the computed base storage location,
  // but mutably borrows the scalar storage location.
  Wnaf {
  - base: &self.base,
  + base: &self.base[..],
  scalar: &mut self.scalar,
  window_size: window_size
  }
  @@ -131,7 +131,7 @@ impl<G: CurveProjective> Wnaf<(), Vec<G>, Vec<i64>> {
  // immutably borrows the computed wNAF form scalar location.
  Wnaf {
  base: &mut self.base,
  - scalar: &self.scalar,
  + scalar: &self.scalar[..],
  window_size: window_size
  }
  }
  