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void operator"" _log ( const char* str, size_t size ) {
  std::cout << "yay" << std::endl;
}
 
int main() {
  "Message"_log;
}

prog.cpp:1:6: warning: user-defined literals only available with -std=c++11 or -std=gnu++11 [enabled by default]
 void operator"" _log ( const char* str, size_t size ) {
      ^
prog.cpp:1:6: warning: user-defined literals only available with -std=c++11 or -std=gnu++11 [enabled by default]
prog.cpp:1:41: error: ‘size_t’ has not been declared
 void operator"" _log ( const char* str, size_t size ) {
                                         ^
prog.cpp:1:53: error: ‘void operator"" _log(const char*, int)’ has invalid argument list
 void operator"" _log ( const char* str, size_t size ) {
                                                     ^
prog.cpp: In function ‘int main()’:
prog.cpp:6:12: error: expected ‘;’ before ‘_log’
   "Message"_log;
            ^
prog.cpp:6:16: warning: statement has no effect [-Wunused-value]
   "Message"_log;
                ^

Standard output is empty