error[E0517]: attribute should be applied to an enum --> $DIR/issue-74082.rs:3:8 | LL | #[repr(i128)] | ^^^^ LL | struct Foo; | ----------- not an enum error[E0517]: attribute should be applied to an enum --> $DIR/issue-74082.rs:6:8 | LL | #[repr(u128)] | ^^^^ LL | struct Bar; | ----------- not an enum error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0517`.