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
8struct foo *foop;
9extern struct foo *getfoo ();
10extern void putfoo (struct foo *foop);
11
12int main ()
13{
14    foop = getfoo ();
15    putfoo (foop);
16    return 0;
17}
18