1 /*  Note that struct foo is opaque (never defined) in this file.  This
2     is allowed by C since this file does not reference any members of
3     the structure.  The debugger needs to be able to associate this
4     opaque structure definition with the full definition in another
5     file.
6 */
7 
8 struct foo *foop;
9 extern struct foo *getfoo ();
10 #ifdef PROTOTYPES
11 extern void putfoo (struct foo *foop);
12 #endif
13 
14 int main ()
15 {
16 #ifdef usestubs
17     set_debug_traps();
18     breakpoint();
19 #endif
20     foop = getfoo ();
21     putfoo (foop);
22     return 0;
23 }
24