cb33f956c3
Even in the PR that introduced this comment, it does not seem like these locals are actually ignored -- just their `source_info` is adjusted: https://github.com/rust-lang/rust/pull/44700/files#diff-ae2f3c7e2f9744f7ef43e96072b10e98d4e3fe74a3a399a3ad8a810fbe56c520R139