gcc/testsuite/gcc.c-torture/execute/pr34415.c

const char *__attribute__((noinline))
foo (const char *p)
{
  const char *end;
  int len = 1;
  for (;;)
    {
      int c = *p;
      c = (c >= 'a' && c <= 'z' ? c - 'a' + 'A' : c);
      if (c == 'B')
	end = p;
      else if (c == 'A')
	{
	  end = p;
	  do
	    p++;
	  while (*p == '+');
	}
      else
	break;
      p++;
      len++;
    }
  if (len > 2 && *p == ':')
    p = end;
  return p;
}

int
main (void)
{
  const char *input = "Bbb:";
  return foo (input) != input + 2;
}