error[E0599]: the method `as_dyn_error` exists for reference `&String`, but its trait bounds were not satisfied
 --> tests/ui/transparent-enum-unnamed-field-not-error.rs:5:13
  |
5 |     #[error(transparent)]
  |             ^^^^^^^^^^^ method cannot be called on `&String` due to unsatisfied trait bounds
  |
 ::: $RUST/alloc/src/string.rs
  |
  | pub struct String {
  | ----------------- doesn't satisfy `String: AsDynError<'_>` or `String: std::error::Error`
  |
  = note: the following trait bounds were not satisfied:
          `String: std::error::Error`
          which is required by `String: AsDynError<'_>`
          `&String: std::error::Error`
          which is required by `&String: AsDynError<'_>`
          `str: Sized`
          which is required by `str: AsDynError<'_>`
          `str: std::error::Error`
          which is required by `str: AsDynError<'_>`