https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97704
--- Comment #1 from gcc-bugs at marehr dot dialup.fu-berlin.de ---
I forgot to add the error message:
```
<source>: In instantiation of 'auto hard_error(t) [with t = int]':
<source>:11:35: required by substitution of 'template<class t> requires
requires{hard_error({});} constexpr auto foo(t, non_exisiting) [with t = int]'
<source>:19:17: required from here
<source>:6:19: error: non-constant condition for static assertion
6 | static_assert(in, "Failure");
| ^~
<source>:6:19: error: 'in' is not a constant expression
```
(For some reasons godbolt shows everything in the compliance view as green,
this link https://godbolt.org/z/Go8Mc5 should also show the compiler error)
