tests/coverage/test_harness.coverage

   LL|       |// Verify that the entry point injected by the test harness doesn't cause
   LL|       |// weird artifacts in the coverage report (e.g. issue #10749).
   LL|       |
   LL|       |// compile-flags: --test
   LL|       |
   LL|       |#[allow(dead_code)]
   LL|      0|fn unused() {}
   LL|       |
   LL|       |#[test]
   LL|      1|fn my_test() {}