Regarding https://lists.isocpp.org/std-proposals/2026/09/19078.php I think this clutters up the library. Plus you can't really tell what storage class it came from. The compiler would need to maintain bookkeeping of the storage class and it would be very OS-dependent. Stack isn't part of the standard. Auto is, but that doesn't correspond to stack. The concept itself can be pleasing, static vs auto vs TLS. Also "heap" isn't part of the standard. I see benefits to this but it would take enormous amount of bookkeeping to hold up.