error: expected expression, found end of macro arguments --> $DIR/attr-invalid-exprs.rs:12:13 | LL | let _ = #[no_output] "Hello, world!"; | ^^^^^^^^^^^^ error: macro expansion ignores token `,` and any following --> $DIR/attr-invalid-exprs.rs:15:13 | LL | let _ = #[duplicate] "Hello, world!"; | ^^^^^^^^^^^^ caused by the macro expansion here | = note: the usage of `duplicate!` is likely invalid in expression context help: you might be missing a semicolon here | LL | let _ = #[duplicate]; "Hello, world!"; | + error: macro expansion ignores token `,` and any following --> $DIR/attr-invalid-exprs.rs:24:9 | LL | #[duplicate] | ^^^^^^^^^^^^ caused by the macro expansion here | = note: the usage of `duplicate!` is likely invalid in expression context help: you might be missing a semicolon here | LL | #[duplicate]; | + error: aborting due to 3 previous errors