https://bugzilla.redhat.com/show_bug.cgi?id=2105831
--- Comment #3 from Fabio Valentini decathorpe@gmail.com --- For reference, a similar change has been pushed to other crates that contain code that's derived from Unicode data.
For unicode-ident, which is now used by syn and other popular crates, this change is already "live": https://github.com/dtolnay/unicode-ident/pull/9
For unicode-xid, which has been mostly replaced by unicode-ident, the change is still pending: https://github.com/unicode-rs/unicode-xid/pull/32