the code is:
struct A {
	int a;
};
struct B {
	struct A;
	int b;
};
int main(){
	struct B b_struct;
	printf("%d",b_struct.a);
// i m using gcc 4.5 ,show if i added the flag -fms-extensions,it can compile and run 
// but  the CDT indexer show error : Field 'a' could not be resolved
// is there any way to support it ?
}