Confused about RLS going away and its implications

From discussion on issue on codeberg (last paragraph of the comment) I understood that this code will no longer work when RLS goes away (code simplified compared to the code in issue). self.* = .{ .rt = rt: { // rt: Runtime self.rt.initStatic(gpa); break :rt self.rt; }, .io = self.rt.io(), }; Why? To my understanding RLS makes it there is no intermediary copy. Which means th...