[Bug c++/85973] [[nodiscard]] on class shall emit a warning for unused anonymous variable

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85973

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2023-03-21
     Ever confirmed|0                           |1
            Summary|[[nodiscard]] shall emit a  |[[nodiscard]] on class
                   |warning for unused          |shall emit a warning for
                   |anonymous variable          |unused anonymous variable
             Status|UNCONFIRMED                 |NEW

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced testcase:
```
struct [[nodiscard]] scope_exit {
        scope_exit(int);
};


int main()
{
    scope_exit{0};
}
```

Note if we move the attribute to the constructor, then GCC will error out.