message: FAPL: make SplitDriver fields public
diff: @@ -345,8 +345,8 @@ impl MultiDriver {
  #[derive(Clone, Debug, PartialEq, Eq)]
  pub struct SplitDriver {
  - meta_ext: String,
  - raw_ext: String,
  + pub meta_ext: String,
  + pub raw_ext: String,
  }
  impl Default for SplitDriver {
  