Function pippenger_optional_multiscalar_mul 

pub fn pippenger_optional_multiscalar_mul<I, J>(
    scalars: I,
    points: J,
) -> Option<EdwardsPoint>
where
    I: IntoIterator,
    I::Item: Borrow<Scalar>,
    J: IntoIterator<Item = Option<EdwardsPoint>>,

Available on docsrs and crate feature alloc only.