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<'_>`