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#include <iostream>
 
struct Thing {
	operator int() const { return 0; }
} thingy;
 
template <typename T>
void print(T l, T r) { std::cout << l << " " << r << "\n"; }
 
int main() {
	int i = 0;
	print(i, thingy);
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:12:17: error: no matching function for call to ‘print(int&, Thing&)’
  print(i, thingy);
                 ^
prog.cpp:12:17: note: candidate is:
prog.cpp:8:6: note: template<class T> void print(T, T)
 void print(T l, T r) { std::cout << l << " " << r << "\n"; }
      ^
prog.cpp:8:6: note:   template argument deduction/substitution failed:
prog.cpp:12:17: note:   deduced conflicting types for parameter ‘T’ (‘int’ and ‘Thing’)
  print(i, thingy);
                 ^

Standard output is empty