error: `default` is not followed by an item
  --> $DIR/default-unmatched-extern.rs:5:5
   |
LL |     default do
   |     ^^^^^^^ the `default` qualifier
   |
   = note: only `fn`, `const`, `type`, or `impl` items may be prefixed by `default`

error: non-item in item list
  --> $DIR/default-unmatched-extern.rs:5:13
   |
LL | extern "C" {
   |            - item list starts here
LL |     default!();
LL |     default do
   |             ^^ non-item starts here
...
LL | }
   | - item list ends here

error: cannot find macro `default` in this scope
  --> $DIR/default-unmatched-extern.rs:4:5
   |
LL |     default!();
   |     ^^^^^^^

error: aborting due to 3 previous errors