Fix comment about placeholders r? @lcnr When this was introduced, briefly returned an `Option`, which is what the comment refers to. https://github.com/rust-lang/rust/pull/86993/changes/a9f1e1c440ae20f0ea99f5e265f24094f1a613a5#diff-8d11697c196da9f44774488ae0bf353283e5c6466a6dd570d7818431b73d4a44R511 Before that this code would just panic, and in the commit right after fixing review comments it does so again: https://github.com/rust-lang/rust/pull/86993/changes/cf001dc8894ae726de96f4db032f11c22f24c393#diff-8d11697c196da9f44774488ae0bf353283e5c6466a6dd570d7818431b73d4a44R560 That comment has been copied around for 5 years now despite not reflecting the behavior hehe Second commit has some general typos I found