error[E0308]: mismatched types
  --> tests/compile-fail/attrs_with_bad_fn.rs:11:22
   |
11 |     #[darling(with = bad_converter)]
   |                      ^^^^^^^^^^^^^
   |                      |
   |                      expected `Result<_, Error>`, found `Vec<Attribute>`
   |                      arguments to this method are incorrect
   |
   = note: expected enum `Result<_, darling::Error>`
            found struct `Vec<Attribute>`
note: method defined here
  --> core/src/error/mod.rs
   |
   |     pub fn handle<T>(&mut self, result: Result<T>) -> Option<T> {
   |            ^^^^^^
help: try wrapping the expression in `Ok`
   |
11 |     #[darling(with = Ok(bad_converter))]
   |                      +++             +