Interface IndexGetDataMut

flow-message/src/cross/mod.rs:84–89

        fn get_ref(&self, key: &'_ Idx) -> Option<&data::Data>;
    }
    pub trait IndexGetDataMut<Idx>
    where
        Idx: ?Sized,
    {
        fn get_mut(&mut self, key: &'_ Idx) -> Option<&mut data::Data>;
    }

    impl<Idx, T, U> IndexSet<Idx, U> for T
    where