1error[E0599]: the method `as_dyn_error` exists for struct `String`, but its trait bounds were not satisfied 2 --> tests/ui/transparent-struct-unnamed-field-not-error.rs:4:9 3 | 44 | #[error(transparent)] 5 | ^^^^^^^^^^^ method cannot be called on `String` due to unsatisfied trait bounds 6 | 7 ::: $RUST/alloc/src/string.rs 8 | 9 | pub struct String { 10 | ----------------- doesn't satisfy `String: AsDynError<'_>` or `String: std::error::Error` 11 | 12 = note: the following trait bounds were not satisfied: 13 `String: std::error::Error` 14 which is required by `String: AsDynError<'_>` 15 `str: Sized` 16 which is required by `str: AsDynError<'_>` 17 `str: std::error::Error` 18 which is required by `str: AsDynError<'_>` 19