| HEADS UP! https://example.com MUST SHOW UP IN THE STDERR FILE! | |
| Normally, a line with errors on it will also have a comment | |
| marking it up as something that needs to generate an error. | |
| The test harness doesn't gather hot comments from this file. | |
| Rustdoc will generate an error for the line, and the `.stderr` | |
| snapshot includes this error, but Compiletest doesn't see it. | |
| If the stderr file changes, make sure the warning points at the URL! |