1 error[E0308]: mismatched types
2 --> $DIR/issue-29084.rs:14:13
5 | ^^^^^^^ expected u8, found &mut u8
8 | ---------- in this macro invocation
10 = note: expected type `u8`
13 error: aborting due to previous error
15 For more information about this error, try `rustc --explain E0308`.