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#include <array>
#include <iostream>
using namespace std;
 
void pretty_print_r3(const array<float, 3> &xs) {
	for (float x : xs ) cout << x << endl;
}
 
int main() {
	auto xs = array<float, 2>{1, 2};
	pretty_print_r3(xs);
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:11:20: error: invalid initialization of reference of type 'const std::array<float, 3u>&' from expression of type 'std::array<float, 2u>'
  pretty_print_r3(xs);
                    ^
prog.cpp:5:6: note: in passing argument 1 of 'void pretty_print_r3(const std::array<float, 3u>&)'
 void pretty_print_r3(const array<float, 3> &xs) {
      ^

Standard output is empty