https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93862
--- Comment #6 from Will Wray <wjwray at gmail dot com> --- Thanks for the quick work. However, I'm not sure that (2) and (3) _are_ invalid. (Sorry, I didn't have time to follow the email thread). I should have provided this link to an exchange with Richard Smith. I'd waited for his response before filing the bug. He says: "In both cases, it's valid to use static_cast to recover the original type." https://cpplang.slack.com/archives/C2PQKRWJU/p1579186047347300 zygoloid Feb 20 Lifetime extension applies; the lifetime extension rules don't care about qualification conversions. Another example: const int *const &r = static_cast<int*&&>(nullptr); performs lifetime extension even though the type of the temporary object (int*) has been lost (mutability-erased) in the reference binding. zygoloid Feb 20 In both cases, it's valid to use static_cast to recover the original type. willw Feb 20 Thanks for the confirmation. That makes sense. willw Feb 21 I filed the gcc bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93862
