Leftover from 6dda40d

sebastianbergmann · sebastianbergmann · commit 6f71fc195a60 · 2017-12-29T09:56:48.000+01:00
diff --git a/src/Driver/Driver.php b/src/Driver/Driver.php
@@ -39,7 +39,7 @@ interface Driver
     /**
      * Start collection of code coverage information.
      */
-    public function start(bool $determineUnusedAndDead = true);
+    public function start(bool $determineUnusedAndDead = true): void;
 
     /**
      * Stop collection of code coverage information.
