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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109277

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I know cppreference is not the standard but usually it has a good summary.

From: https://en.cppreference.com/w/cpp/types/is_convertible :
```
>From and To shall each be a complete type, (possibly cv-qualified) void, or=
 an
array of unknown bound. Otherwise, the behavior is undefined.
```

So someone who understands the C++ standard better than me should be able to
answer if this is in fact illformed code.=