Fix build

tests/PHPStan/Rules/DeadCode/UnusedPrivatePropertyRuleTest.php

@@ -131,4 +131,11 @@ public function testAlwaysUsedTags(): void
 		]);
 	}
 
+	public function testTrait(): void
+	{
+		$this->alwaysWrittenTags = [];
+		$this->alwaysReadTags = [];
+		$this->analyse([__DIR__ . '/data/private-property-trait.php'], []);
+	}
+
 }

tests/PHPStan/Rules/DeadCode/data/private-property-trait.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace UnusedPropertyTrait;
+
+trait FooTrait
+{
+
+	private $prop1;
+
+	private $prop2;
+
+	public function doFoo()
+	{
+		echo $this->prop1;
+	}
+
+	public function setFoo($prop1)
+	{
+		$this->prop1 = $prop1;
+	}
+
+}
+
+class ClassUsingTrait
+{
+
+	use FooTrait;
+
+}

tests/PHPStan/Rules/DeadCode/data/unused-private-property.php

@@ -154,29 +154,3 @@ class TextExtension
 	private $used;
 
 }
-
-trait FooTrait
-{
-
-	private $prop1;
-
-	private $prop2;
-
-	public function doFoo()
-	{
-		echo $this->prop1;
-	}
-
-	public function setFoo($prop1)
-	{
-		$this->prop1 = $prop1;
-	}
-
-}
-
-class ClassUsingTrait
-{
-
-	use FooTrait;
-
-}