diff -up tests/10-event-data-dtor.phpt.old tests/10-event-data-dtor.phpt
--- tests/10-event-data-dtor.phpt.old	2018-05-24 10:02:40.399787966 +0200
+++ tests/10-event-data-dtor.phpt	2018-05-24 10:02:52.253859826 +0200
@@ -11,7 +11,7 @@ class _Indicator {
 		$this->i = $i;
 	}
 	public function __destruct() {
-		echo $this->i, "\n";
+		echo "" . $this->i . "\n";
 	}
 }