LL | use r#extern::foo;
| ^^^^^^^^
-error: aborting due to previous error
+error[E0432]: unresolved import `r#extern`
+ --> $DIR/keyword-extern-as-identifier-use.rs:1:5
+ |
+LL | use extern::foo;
+ | ^^^^^^ maybe a missing crate `r#extern`?
+
+error: aborting due to 2 previous errors
+For more information about this error, try `rustc --explain E0432`.