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