[Bug c++/110158] Cannot use union with std::string inside in constant expression

[danakj at orodu dot net via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110158

--- Comment #5 from danakj at orodu dot net ---
As a means to work around #4 in static asserts, making your string long enough
that it avoids the SSO will allow the compiler to accept it.