#include<stdio.h> 
	struct stud
	{
		char name[20];
		int rollNo;
		struct stud next;
	};

	int main()
	{
		struct stud student={"xyz"};
		printf("rollNo = %d",student.rollNo);
		return 0;
	}

Line 6: error: field 'next' has incomplete type
t.c:12: confused by earlier errors, bailing out