error: cannot find attribute `C` in this scope --> $DIR/proc-macro-attributes.rs:7:3 | LL | #[C] | ^ help: a derive helper attribute with a similar name exists: `B` error[E0659]: `B` is ambiguous (derive helper attribute vs any other name) --> $DIR/proc-macro-attributes.rs:6:3 | LL | #[B] | ^ ambiguous name | note: `B` could refer to the derive helper attribute defined here --> $DIR/proc-macro-attributes.rs:11:10 | LL | #[derive(B)] | ^ note: `B` could also refer to the derive macro imported here --> $DIR/proc-macro-attributes.rs:3:1 | LL | #[macro_use] | ^^^^^^^^^^^^ error[E0659]: `B` is ambiguous (derive helper attribute vs any other name) --> $DIR/proc-macro-attributes.rs:8:3 | LL | #[B(D)] | ^ ambiguous name | note: `B` could refer to the derive helper attribute defined here --> $DIR/proc-macro-attributes.rs:11:10 | LL | #[derive(B)] | ^ note: `B` could also refer to the derive macro imported here --> $DIR/proc-macro-attributes.rs:3:1 | LL | #[macro_use] | ^^^^^^^^^^^^ error[E0659]: `B` is ambiguous (derive helper attribute vs any other name) --> $DIR/proc-macro-attributes.rs:9:3 | LL | #[B(E = "foo")] | ^ ambiguous name | note: `B` could refer to the derive helper attribute defined here --> $DIR/proc-macro-attributes.rs:11:10 | LL | #[derive(B)] | ^ note: `B` could also refer to the derive macro imported here --> $DIR/proc-macro-attributes.rs:3:1 | LL | #[macro_use] | ^^^^^^^^^^^^ error[E0659]: `B` is ambiguous (derive helper attribute vs any other name) --> $DIR/proc-macro-attributes.rs:10:3 | LL | #[B(arbitrary tokens)] | ^ ambiguous name | note: `B` could refer to the derive helper attribute defined here --> $DIR/proc-macro-attributes.rs:11:10 | LL | #[derive(B)] | ^ note: `B` could also refer to the derive macro imported here --> $DIR/proc-macro-attributes.rs:3:1 | LL | #[macro_use] | ^^^^^^^^^^^^ error: aborting due to 5 previous errors For more information about this error, try `rustc --explain E0659`.