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#include <iostream>
using namespace std;
 
void only_accepts_rvalues(string&& name)
{
	cout << name << endl;
}
 
int main() {
	// this doesn't compile
	string name{"banachtarski"};
	only_accepts_rvalues(name);
 
	// This does
	only_accepts_rvalues(std::move(name));
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:12:27: error: cannot bind 'std::string {aka std::basic_string<char>}' lvalue to 'std::string&& {aka std::basic_string<char>&&}'
  only_accepts_rvalues(name);
                           ^
prog.cpp:4:6: note:   initializing argument 1 of 'void only_accepts_rvalues(std::string&&)'
 void only_accepts_rvalues(string&& name)
      ^

Standard output is empty