fixup! Add MemoizationPropertyRule

Author: zonuexe

build/PHPStan/Build/MemoizationPropertyRule.php

@@ -8,6 +8,7 @@
 use PhpParser\Node\Expr\BinaryOp\Identical;
 use PhpParser\Node\Expr\ConstFetch;
 use PhpParser\Node\Expr\PropertyFetch;
+use PhpParser\Node\Expr\Variable;
 use PhpParser\Node\Identifier;
 use PhpParser\Node\Stmt\Expression;
 use PhpParser\Node\Stmt\If_;
@@ -53,8 +54,9 @@ public function processNode(Node $node, Scope $scope): array
 
 		[$ifNode, $returnNode] = $stmts;
 
-		if (!$returnNode instanceof Return_ ||
-			!$returnNode->expr instanceof PropertyFetch
+		if (!$returnNode instanceof Return_
+			|| !$returnNode->expr instanceof PropertyFetch
+			|| !$returnNode->expr->var instanceof Variable
 		) {
 			return [];
 		}
@@ -66,6 +68,7 @@ public function processNode(Node $node, Scope $scope): array
 			|| $ifNode->else !== null
 			|| !$ifNode->cond instanceof Identical
 			|| !$ifNode->cond->left instanceof PropertyFetch
+			|| !$ifNode->cond->left->var instanceof Variable
 			|| !$ifNode->cond->right instanceof ConstFetch
 			|| strcasecmp($ifNode->cond->right->name->name, 'null') !== 0
 		) {
@@ -79,7 +82,7 @@ public function processNode(Node $node, Scope $scope): array
 		}
 
 		if (get_class($returnNode->expr) !== get_class($ifNode->cond->left)
-			|| get_class($returnNode->expr->var) !== get_class($ifNode->cond->left->var)
+			|| $returnNode->expr->var->name !== $ifNode->cond->left->var->name
 			|| !$returnNode->expr->name instanceof Identifier
 			|| !$ifNode->cond->left->name instanceof Identifier
 			|| $returnNode->expr->name->name !== $ifNode->cond->left->name->name