Recognize generator functions

Author: rezonanc-oxid

Oxid/Sniffs/Commenting/FunctionCommentSniff.php

@@ -115,7 +115,9 @@ protected function functionHasReturnStatement(PHP_CodeSniffer_File $phpcsFile, $
         $returnStatement = false;
         if (isset($sFunctionToken['scope_closer']) and isset($sFunctionToken['scope_opener'])) {
             $startSearch = $continueSearch !== null ? $continueSearch : $sFunctionToken['scope_opener'];
-            $returnStatement = $phpcsFile->findNext(T_RETURN, $startSearch, $sFunctionToken['scope_closer']);
+            $returnStatement =
+                $phpcsFile->findNext(T_RETURN, $startSearch, $sFunctionToken['scope_closer'])
+                || $phpcsFile->findNext(T_YIELD,  $startSearch, $sFunctionToken['scope_closer']);
         }
 
         if ($returnStatement !== false) {