[Bug c++/115808] Different behavior with optimizations enabled and disabled.

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115808

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
MSVC rejects this code:
```
<source>(46): error C3779: 'utempl::loopholes::Magic': a function that returns
'auto' cannot be used before it is defined
<source>(6): note: see declaration of 'utempl::loopholes::Magic'
<source>(46): error C2062: type 'unknown-type' unexpected

```


So I am suspecting this might be not valid code but no diagnostic required.