--- /dev/null
+struct A {long a1; long a2; long a3;} a={1,2,3};
+struct B {long a1; long a2; long a3;} b={10,20,30};
+struct C {long a1; long a2; long a3;} c={100,200,300};
+struct S {long a1; long a2; long a3;} s={(long*)&a,(long*)&b,(long*)&c};
+extern long f(long*);
+
+return ( 111==f((long*)&s));