public function test()
{
$this->assertNotSpot('unpack();');
$this->assertNotSpot('unpack("x");');
$this->assertHasSpot('unpack("a");');
$this->assertHasSpot('unpack("A");');
$this->assertHasSpot('unpack($a);');
$this->assertHasSpot('unpack($a."");');
$this->assertHasSpot('unpack("$b");');
}