Macro searchspot::type_vec_from_params

macro_rules! type_vec_from_params {
    (
                                      $ t : ident , $ params : expr , $ param
                                      : expr ) => { ... };
}

Like vec_from_params, but expects $t (instead of Vec<$t>) and return Vec<$t>. Elements that cannot be actually casted to $t are discarded.