`<queue>`, `<stack>`: P3235R3 not implemented
We do not implement the required partial specializations of enable_nonlocking_formatter_optimization for queue, priority_queue, and stack. It's quite clearly a defect that container adaptors unconditionally enable the optimization regardless of whether the underlying containers or their elements enable the optimization.
Paper: WG21-P3235R3 std::print More Types Faster With Less Memory
This is LWG-4146.
LWG issue submitted, will report back when it is numbered.
LWG-4398 is Tentatively Ready now. I'm not sure whether produce code change is needed because an enable_nonlocking_formatter_optimization specialization is false by default.