fixup! fixup! Replace error-prone instanceof in Rules classes

Author: zonuexe

src/Rules/Variables/CompactVariablesRule.php

@@ -9,6 +9,7 @@
 use PHPStan\Type\Constant\ConstantStringType;
 use PHPStan\Type\Type;
 use function array_merge;
+use function count;
 use function sprintf;
 use function strtolower;