/in/foo.c:46:5: error: redefinition of 'main'
 int main()
     ^~~~
/in/foo.c:11:5: note: previous definition of 'main' was here
 int main(int argc, const char * argv[]) {
     ^~~~
/in/foo.c: In function 'main':
/in/foo.c:47:1: error: number of arguments doesn't match prototype
 {
 ^
/in/foo.c:11:5: error: prototype declaration
 int main(int argc, const char * argv[]) {
     ^~~~