int main() {
  char const *p = "abcdef";
  char * const q = "uvwxyz";
  char const * const r = "hijklmn";
  p++;
  q++;
  r++;
  (*p)++;
  (*q)++;
  (*r)++;
  return 0;
}
/* end */

In function 'main':
Line 6: error: increment of read-only variable 'q'
Line 7: error: increment of read-only variable 'r'
Line 8: error: increment of read-only location
Line 10: error: increment of read-only location