error[E0789]: `rustc_allowed_through_unstable_modules` attribute must be paired with a `stable` attribute --> $DIR/E0789.rs:9:1 | LL | struct Foo; | ^^^^^^^^^^^ error[E0789]: `rustc_allowed_through_unstable_modules` attribute must be paired with a `stable` attribute --> $DIR/E0789.rs:9:1 | LL | struct Foo; | ^^^^^^^^^^^ | = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0789`.