error: malformed `repr` attribute input --> $DIR/repr.rs:1:1 | LL | #[repr] | ^^^^^^^ help: must be of the form: `#[repr(C)]` error: malformed `repr` attribute input --> $DIR/repr.rs:4:1 | LL | #[repr = "B"] | ^^^^^^^^^^^^^ help: must be of the form: `#[repr(C)]` error: malformed `repr` attribute input --> $DIR/repr.rs:7:1 | LL | #[repr = "C"] | ^^^^^^^^^^^^^ help: must be of the form: `#[repr(C)]` error: aborting due to 3 previous errors