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#include <iostream>
 
using namespace std;
 
constexpr void f (double speed)
{
	constexpr double C = 299792.468;
	const double local_max = 160.0/(60*60);
	static_assert(local_max<C,"can't go that fast");
}
 
int main()
{
  f(3.25) ;
 
	cout << "Reached here!";
	return 0;
}
 

prog.cpp:9:16: error: static_assert expression is not an integral constant expression
        static_assert(local_max<C,"can't go that fast");
                      ^~~~~~~~~~~
prog.cpp:9:16: note: read of non-constexpr variable 'local_max' is not allowed in a constant expression
prog.cpp:8:15: note: declared here
        const double local_max = 160.0/(60*60);
                     ^
1 error generated.

Standard output is empty