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#include <iostream>
using namespace std;
 
#define CONCAT_MACRO_(a,b) a ## b
 
#define COMLIN CONCAT_MACRO_(/,/)
 
 
int main()
{
	cout << "1\n";
	COMLIN << "Sakra!\n";
	cout << "2\n";
 
	return 0;
}

prog.cpp:6:30: error: pasting "/" and "/" does not give a valid preprocessing token
 #define COMLIN CONCAT_MACRO_(/,/)
                              ^
prog.cpp:4:28: note: in definition of macro ‘CONCAT_MACRO_’
 #define CONCAT_MACRO_(a,b) a ## b
                            ^
prog.cpp:12:2: note: in expansion of macro ‘COMLIN’
  COMLIN << "Sakra!\n";
  ^
prog.cpp: In function ‘int main()’:
prog.cpp:6:30: error: expected primary-expression before ‘/’ token
 #define COMLIN CONCAT_MACRO_(/,/)
                              ^
prog.cpp:4:28: note: in definition of macro ‘CONCAT_MACRO_’
 #define CONCAT_MACRO_(a,b) a ## b
                            ^
prog.cpp:12:2: note: in expansion of macro ‘COMLIN’
  COMLIN << "Sakra!\n";
  ^
prog.cpp:6:32: error: expected primary-expression before ‘/’ token
 #define COMLIN CONCAT_MACRO_(/,/)
                                ^
prog.cpp:4:33: note: in definition of macro ‘CONCAT_MACRO_’
 #define CONCAT_MACRO_(a,b) a ## b
                                 ^
prog.cpp:12:2: note: in expansion of macro ‘COMLIN’
  COMLIN << "Sakra!\n";
  ^
prog.cpp:12:9: error: expected primary-expression before ‘<<’ token
  COMLIN << "Sakra!\n";
         ^

Standard output is empty