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`.