error: transparent variant can't contain #[source]
 --> tests/ui/transparent-enum-source.rs:6:11
  |
3 | #[derive(Error, Debug)]
  |          ----- in this derive macro expansion
...
6 |     Other(#[source] anyhow::Error),
  |           ^^^^^^^^^
  |
  = note: this error originates in the derive macro `Error` (in Nightly builds, run with -Z macro-backtrace for more info)