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#include <iostream>
#include <vector>
#include <string>
using namespace std;
 
struct string_view { char* data; std::size_t len; };
 
typedef vector<string_view> tokens;
 
tokens tokenize(std::string& data)
{
	return tokens{};
}
 
std::string get_input_string()
{
	return std::string("test");
}
 
int main() 
{
	tokenize(get_input_string());
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:22:29: error: invalid initialization of non-const reference of type ‘std::string& {aka std::basic_string<char>&}’ from an rvalue of type ‘std::string {aka std::basic_string<char>}’
  tokenize(get_input_string());
                             ^
prog.cpp:10:8: error: in passing argument 1 of ‘tokens tokenize(std::string&)’
 tokens tokenize(std::string& data)
        ^

Standard output is empty