[Bug libstdc++/112642] ranges::fold_left tries to access inactive union member of string in constant expression

[miro.palmu at helsinki dot fi]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112642

--- Comment #3 from Miro Palmu <miro.palmu at helsinki dot fi> ---
Further reduced:

#include <string>
using namespace std::literals;

consteval void bar() {
    auto _ = [](auto s) { return s; }(""s);
}

int main() {
    bar();    
    return 0;
}