message: Mark additive group as abelian
diff: @@ -1022,6 +1022,8 @@ mod alga_impls {
  impl<N: Copy + Num + Neg<Output=N>, I: SpIndex> AbstractGroup<Additive> for CsVecI<N, I> {}
  + impl<N: Copy + Num + Neg<Output=N>, I: SpIndex> AbstractGroupAbelian<Additive> for CsVecI<N, I> {}
  +
  #[cfg(test)]
  mod test {
  use super::*;
  