error: some variants are not matched explicitly
  --> $DIR/stable-omitted-patterns.rs:23:9
   |
LL |         _ => {}
   |         ^ pattern `Stable2` not covered
   |
note: the lint level is defined here
  --> $DIR/stable-omitted-patterns.rs:22:16
   |
LL |         #[deny(non_exhaustive_omitted_patterns)]
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   = help: ensure that all variants are matched explicitly by adding the suggested match arms
   = note: the matched value is of type `UnstableEnum` and the `non_exhaustive_omitted_patterns` attribute was found

error: aborting due to previous error