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#include <iostream>
#include <string>
 
using namespace std;
 
template<class T>
void test1(const T &&t)
{
	test2(t);
}
 
template<class T>
void test2(const T &&t)
{
	return;
}
 
int main (void)
{
	test1(std::string{" "});
 
	return 0;
}

prog.cpp: In instantiation of 'void test1(const T&&) [with T = std::basic_string<char>]':
prog.cpp:20:24:   required from here
prog.cpp:9:7: error: 'test2' was not declared in this scope, and no declarations were found by argument-dependent lookup at the point of instantiation [-fpermissive]
  test2(t);
       ^
prog.cpp:13:6: note: 'template<class T> void test2(const T&&)' declared here, later in the translation unit
 void test2(const T &&t)
      ^
prog.cpp:9:7: error: cannot bind 'const std::basic_string<char>' lvalue to 'const std::basic_string<char>&&'
  test2(t);
       ^
prog.cpp:13:6: note:   initializing argument 1 of 'void test2(const T&&) [with T = std::basic_string<char>]'
 void test2(const T &&t)
      ^

Standard output is empty