error[E0308]: mismatched types --> $DIR/suggest-ref-macro.rs:15:11 | LL | x(123); | ^^^ | | | expected `&mut i32`, found integer | help: consider mutably borrowing here: `&mut 123` ... LL | bla!(); | ------- in this macro invocation | = note: this error originates in the macro `bla` (in Nightly builds, run with -Z macro-backtrace for more info) error[E0308]: mismatched types --> $DIR/suggest-ref-macro.rs:26:10 | LL | bla!(456); | ^^^ | | | expected `&mut i32`, found integer | help: consider mutably borrowing here: `&mut 456` error[E0308]: mismatched types --> $DIR/suggest-ref-macro.rs:8:1 | LL | #[hello] | ^^^^^^^^ expected `&mut i32`, found integer | = note: this error originates in the attribute macro `hello` (in Nightly builds, run with -Z macro-backtrace for more info) error: aborting due to 3 previous errors For more information about this error, try `rustc --explain E0308`.