/in/foo.c: In function 'main':
/in/foo.c:7:5: warning: 'main' is normally a non-static function [-Wmain]
    7 | int main()
      |     ^~~~
/in/foo.c: At top level:
/in/foo.c:7:5: warning: 'main' defined but not used [-Wunused-function]