/in/foo.c: In function 'main':
/in/foo.c:5:5: warning: 'main' is normally a non-static function [-Wmain]
 int main(int argc, char *argv[]) {
     ^~~~
/in/foo.c:21:1: error: expected declaration or statement at end of input
 }
 ^
At top level:
/in/foo.c:5:5: warning: 'main' defined but not used [-Wunused-function]
 int main(int argc, char *argv[]) {
     ^~~~