error[E0659]: `empty_helper` is ambiguous --> $DIR/helper-attr-blocked-by-import-ambig.rs:7:3 | LL | #[empty_helper] | ^^^^^^^^^^^^ ambiguous name | = note: ambiguous because of a name conflict with a derive helper attribute note: `empty_helper` could refer to the derive helper attribute defined here --> $DIR/helper-attr-blocked-by-import-ambig.rs:10:10 | LL | #[derive(Empty)] | ^^^^^ note: `empty_helper` could also refer to the attribute macro imported here --> $DIR/helper-attr-blocked-by-import-ambig.rs:5:5 | LL | use test_macros::empty_attr as empty_helper; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ = help: use `crate::empty_helper` to refer to this attribute macro unambiguously warning: derive helper attribute is used before it is introduced --> $DIR/helper-attr-blocked-by-import-ambig.rs:7:3 | LL | #[empty_helper] | ^^^^^^^^^^^^ ... LL | #[derive(Empty)] | ----- the attribute is introduced here | = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! = note: for more information, see issue #79202 = note: `#[warn(legacy_derive_helpers)]` on by default error: aborting due to 1 previous error; 1 warning emitted For more information about this error, try `rustc --explain E0659`.