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#include <stdio.h>
 
typedef struct ADef A;
struct A 
{
    int value;
};
 
typedef struct BDEf B;
struct B 
{
    struct A;
    int zorg;
};
 
int main()
{
    struct A a;
    struct B b;
 
    b.value = 5;
    b.zorg = 42;
 
    return 0;
}
 

prog.c:12:13: warning: declaration does not declare anything
     struct A;
             ^
prog.c: In function ‘main’:
prog.c:21:6: error: ‘struct B’ has no member named ‘value’
     b.value = 5;
      ^
prog.c:19:14: warning: variable ‘b’ set but not used [-Wunused-but-set-variable]
     struct B b;
              ^
prog.c:18:14: warning: unused variable ‘a’ [-Wunused-variable]
     struct A a;
              ^

Standard output is empty