error: expected identifier
 --> tests/fail/missing-tag-2.rs:6:3
  |
6 | #[test_tag::tag]
  |   ^^^^^^^^^^^^^

error[E0601]: `main` function not found in crate `$CRATE`
 --> tests/fail/missing-tag-2.rs:8:21
  |
8 | fn cant_compile() {}
  |                     ^ consider adding a `main` function to `$DIR/tests/fail/missing-tag-2.rs`