[DeadCode] Handle assign on Arg on RemoveUnusedPrivatePropertyRector

rules-tests/DeadCode/Rector/Property/RemoveUnusedPrivatePropertyRector/Fixture/on_arg.php.inc

@@ -0,0 +1,39 @@
+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Property\RemoveUnusedPrivatePropertyRector\Fixture;
+
+class OnArg extends TestCase
+{
+    private CarbonImmutable $now;
+
+    #[\Override]
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        CarbonImmutable::setTestNow(
+            $this->now = nowEagleTz(),
+        );
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Property\RemoveUnusedPrivatePropertyRector\Fixture;
+
+class OnArg extends TestCase
+{
+    #[\Override]
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        CarbonImmutable::setTestNow(
+            nowEagleTz(),
+        );
+    }
+}
+
+?>

rules/DeadCode/Rector/Property/RemoveUnusedPrivatePropertyRector.php

@@ -5,6 +5,7 @@
 namespace Rector\DeadCode\Rector\Property;
 
 use PhpParser\Node;
+use PhpParser\Node\Arg;
 use PhpParser\Node\Expr\Assign;
 use PhpParser\Node\Stmt\Class_;
 use PhpParser\Node\Stmt\Expression;
@@ -155,8 +156,16 @@ private function shouldSkipClass(Class_ $class): bool
 
     private function removePropertyAssigns(Class_ $class, string $propertyName): void
     {
-        $this->traverseNodesWithCallable($class, function (Node $node) use ($class, $propertyName): null|int|Return_ {
+        $this->traverseNodesWithCallable($class, function (Node $node) use ($class, $propertyName): null|int|Return_|Arg {
             if (! $node instanceof Expression && ! $node instanceof Return_) {
+                if ($node instanceof Arg && $node->value instanceof Assign) {
+                    $assign = $node->value;
+                    if ($this->propertyFetchFinder->isLocalPropertyFetchByName($assign->var, $class, $propertyName)) {
+                        $node->value = $assign->expr;
+                        return $node;
+                    }
+                }
+
                 return null;
             }