`<format>`: `volatile integral<T>` compilation error

[jovibor]

#include <format>

int main()
{
    volatile int vol = 42;
    auto ret = std::format("{}", vol);
}

error C2668: 'std::_Format_arg_traits<_Context>::_Phony_basic_format_arg_constructor': ambiguous call to overloaded function

The same code compiles fine with {fmt}.
MSVS 17.0.4

Update:
It's rather volatile integral types fail to compile, because volatile double and float compile fine.

[fsb4000]

probably LWG issue needed.

Look: #2579 (comment)

It seems we can't fix the issue for now...

[CaseyCarter]

probably LWG issue needed.

I'm currently gathering requirements for such an LWG issue on the WG21 reflectors, trying to determine the design intent.

[barcharcraz]

Should this be closed now that #2579 is merged?

[barcharcraz]

Allright, closing given #2579

[CaseyCarter]

FWIW, the workaround for scalar volatile types is literally one keystroke: use unary + to turn your volatile lvalue into a non-volatile prvalue a la std::format("{}", +vol);.