#include <iostream>
#include <memory>
#include <exception>
using namespace std;
 
int randomint() {
  throw std::runtime_error("whoops");
 
  return 4;
}
 
void byval(std::unique_ptr<int> x, int y) {
  std::cout << *x + y << "\n";	
}
 
int main() {
 
	auto n = std::make_unique<int>(5);
	try {
		byval(std::move(n), randomint());
	} catch (std::exception& e) {
		std::cout << e.what() << "\n";
	}
 
	if (n) std::cout << "intact: " << *n << "\n";
	return 0;
}

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