Function polylog_impl 

pub fn polylog_impl<P, E, V>(z_in: V, order: PolylogOrder<E, E::Signed>) -> V
where
    P: Policy,
    E: PolylogElement,
    V: FloatVectorWithBits<Element = E> + RealMathWithPolicy<Element = E>,
    V::Signed: GenericVector<Element = E::Signed>,

The real part of Li_s(z) for real z, every real order. See the module documentation.