[Bug c++/118066] Diagnostic for variadic concept with fold expression on other concepts is unhelpful

[sergey at murzin dot pw via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118066

--- Comment #1 from Sergei Murzin <sergey at murzin dot pw> ---
A better CE link https://compiler-explorer.com/z/3dG8zKPfb

Where we can also see that Clang is actually quite good at displaying this sort
of failure.