In the following C++ program:
#include <utility>
#include <cmath>
extern "C" int printf(const char*,...);
std::pair<double, double> sincos(double s) {
return {std::sin(s), std::cos(s)};
}
void g(double a, double b) {
printf("sin(a)=%f; cos(b)=%f\n", a, b);
}
auto [a,b] = sincos(30);
if (a < b) // <---- HERE
g(a,b);
int main() {
}
An if statement appears at namespace scope.
This seems to not be allowed by the standard C++ grammar (or is it?), but clang accepts it:
https://godbolt.org/z/ET5Gv8Ebf
Is this an extension? If so, is it documented somewhere?
