src/test/ui/error-codes/E0004-2.stderr

   1 error[E0004]: non-exhaustive patterns: `None` and `Some(_)` not covered
   2   --> $DIR/E0004-2.rs:4:11
   3    |
   4 LL |     match x { }
   5    |           ^ patterns `None` and `Some(_)` not covered
   6    |
   7    = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
   8
   9 error: aborting due to previous error
  10
  11 For more information about this error, try `rustc --explain E0004`.