Function rv::data::extract_stat

pub fn extract_stat<Fx, X, Ctor>(
    x: &DataOrSuffStat<'_, X, Fx>, 
    stat_ctor: Ctor
) -> Fx::Stat where
    Fx: HasSuffStat<X>,
    Fx::Stat: Clone,
    Ctor: Fn() -> Fx::Stat, 

Convert a DataOrSuffStat into a Stat