Also hash spans inside the same file as relative (V2) Hashes spans relatively to their parent, even if they are not contained inside their parent. Fixes https://github.com/rust-lang/rust/issues/150400 Closes https://github.com/rust-lang/rust/pull/143882, as this is a successor PR This PR is very closely based on that PR with a few minor changes, so to give proper credit I made @cjgillot coauthor of the commit.