error[E0308]: `match` arms have incompatible types
  --> $DIR/single-line.rs:2:52
   |
LL |     let _ = match Some(42) { Some(x) => x, None => "" };
   |             --------------              -          ^^ expected integer, found `&str`
   |             |                           |
   |             |                           this is found to be of type `{integer}`
   |             `match` arms have incompatible types

error: aborting due to 1 previous error

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