fork(3) download

#include <stdio.h>
 
struct A
{
	struct B{};
};
 
struct B
{};
 
int main() {
	printf("%d | %d", sizeof(struct A), sizeof(struct B), sizeof(struct A::struct B));
	return 0;
}
 

prog.c:5:12: warning: declaration does not declare anything
  struct B{};
            ^
prog.c:8:8: error: redefinition of ‘struct B’
 struct B
        ^
prog.c:5:9: note: originally defined here
  struct B{};
         ^
prog.c: In function ‘main’:
prog.c:12:71: error: expected ‘)’ before ‘:’ token
  printf("%d | %d", sizeof(struct A), sizeof(struct B), sizeof(struct A::struct B));
                                                                       ^
prog.c:12:11: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  printf("%d | %d", sizeof(struct A), sizeof(struct B), sizeof(struct A::struct B));
           ^
prog.c:12:16: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long unsigned int’ [-Wformat=]
  printf("%d | %d", sizeof(struct A), sizeof(struct B), sizeof(struct A::struct B));
                ^
prog.c:12:9: warning: too many arguments for format [-Wformat-extra-args]
  printf("%d | %d", sizeof(struct A), sizeof(struct B), sizeof(struct A::struct B));
         ^~~~~~~~~

Standard output is empty