error[E0408]: variable `beta` is not bound in all patterns
  --> $DIR/issue-2848.rs:14:7
   |
LL |       alpha | beta => {}
   |       ^^^^^   ---- variable not in all patterns
   |       |
   |       pattern doesn't bind `beta`

error[E0170]: pattern binding `beta` is named the same as one of the variants of the type `bar::foo`
  --> $DIR/issue-2848.rs:14:15
   |
LL |       alpha | beta => {}
   |               ^^^^ help: to match on the variant, qualify the path: `bar::foo::beta`
   |
   = note: `#[deny(bindings_with_variant_name)]` on by default

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0170, E0408.
For more information about an error, try `rustc --explain E0170`.