According to https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2391r0.pdf https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p23..., it's an "unad

According to https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2391r0.pdf https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p23..., it's an "unadopted feature being explored." There's more information about the proposal at https://gustedt.wordpress.com/2022/01/15/a-defer-feature-using-lambda-expressions/ https://gustedt.wordpress.com/2022/01/15/a-defer-feature-usi...