MSVC 16.10.0 Preview 2 consteval bug repro

vs_2019_16.10.0_pre2_consteval_bug.cpp

// Minimal repro for producing an erroneous C7595 error in Visual Studio 2019 16.10.0 Preview 2 (CL 19.29.30031.0).
//
// Steps to reproduce:
// 1. Compile with /std:c++latest in Visual Studio 2019 16.10.0 Preview 2 (CL 19.29.30031.0)
// 2. Observe C7595 at the line marked below
// 3. Comment out the 'REPRO' line and rebuild
// 4. Observe that plain ol' constexpr works OK

using size_t = decltype(sizeof(void*));

#define REPRO // comment this out to see a workaround using constexpr

#ifdef REPRO
	#define CONSTEVAL consteval
#else
	#define CONSTEVAL constexpr
#endif

[[nodiscard]]
CONSTEVAL size_t operator"" _sz(unsigned long long n) noexcept
{
	return static_cast<size_t>(n);
}

int get_val(size_t coeff = 0_sz) noexcept // C7595
{
	return static_cast<int>(coeff);
}

int main()
{
	return get_val();
}