20011023-1.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

/* Test whether tree inlining works with prototyped nested functions.  */

extern void foo (char *x);
void bar (void);
void bar (void)
{
  auto void baz (void);
  void baz (void)
    {
      char tmp[2];
      foo (tmp);
    }
  baz ();
}