[Bug c++/121671] Confusing compile error message with std::visit and std::format_string

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121671

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:

#include <variant>
#include <format>

template<class... Args>
void logging(std::format_string<Args...>, Args&&... args){}

void f()
{
    auto visitor = [&](int i){
      logging("({}}", i);
    };
    std::variant<int> variant;
    variant.visit(visitor);
}