A joint Study Group between the C (WG14) and C++ (WG21) Committees to ensure the longterm synchronization and cooperation of the C and C++ programming languages where any mutual interests lie.
We don't need to discuss this, per se: while WG14 can accept this, WG21 is free to invent language syntax separately from WG14 without needing SG22 or WG14 approval.
Issue tracking the SG22 discussion of P2039R0 do_until Loop (Menashe Rosemberg)
WG21 issue