As far as I understood, forget is with source code lines in the scope.   while (int a = 4; true) {    a; // always valid    if (b)      forget a; // invalid or no effect in while loop    forget a;    a; // invalid, but only for this iteration }    -----Ursprüngliche Nachricht----- Von:Ville Voutilainen via Std-Proposals <std-proposals_at_[hidden]> Gesendet:Mi 12.08.2026 16:04 Betreff:Re: [std-proposals] A new C++ keyword: forget An:std-proposals_at_[hidden]; CC:Ville Voutilainen <ville.voutilainen_at_[hidden]>; Udo Steinbach <usenet_at_[hidden]>; On Wed, 12 Aug 2026 at 16:52, Udo Steinbach via Std-Proposals <std-proposals_at_[hidden]> wrote: > > Again: Benefit? > I don't see an answer on the most important question. Three relatively-concrete use cases come to mind: 1) poisoning a variable after it's been moved from 2) poisoning a task graph after it's been launched (which in Senders is also a move, but elsewhere might not be) 3) poisoning a task completion after its result has been received -- Std-Proposals mailing list Std-Proposals_at_[hidden] https://lists.isocpp.org/mailman/listinfo.cgi/std-proposals