[Bug c++/103653] New: GCC rejected int x = 0; auto(x); in C++23

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103653

            Bug ID: 103653
           Summary: GCC rejected int x = 0;  auto(x); in C++23
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

int main() {
  int x = 0;
  auto(x);
}

Should this work? GCC rejects it with:
<source>:3:3: error: declaration of 'auto x' has no initializer
    3 |   auto(x);
      |   ^~~~
Isn't this using auto to decay-copy the variable x? Please correct me if I am
wrong.

https://godbolt.org/z/TxorTr56o