error[E0308]: mismatched types
  --> $DIR/issue-5358-1.rs:6:9
   |
LL |     match S(Either::Left(5)) {
   |           ------------------ this expression has type `S`
LL |         Either::Right(_) => {}
   |         ^^^^^^^^^^^^^^^^ expected struct `S`, found enum `Either`
   |
   = note: expected struct `S`
                found enum `Either<_, _>`
help: try wrapping the pattern in `S`
   |
LL |         S(Either::Right(_)) => {}
   |         ++                +
help: you might have meant to use field `0` whose type is `Either<usize, usize>`
   |
LL |     match S(Either::Left(5)).0 {
   |           ~~~~~~~~~~~~~~~~~~~~

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.