From 6104c28c08dead3b6e43459605b74e9248918d2b Mon Sep 17 00:00:00 2001
From: Valentin Udaltsov <udaltsov.valentin@gmail.com>
Date: Thu, 14 Jun 2018 03:19:59 +0300
Subject: [PATCH] [Framework][Workflow] Added support for interfaces

---
 .../FrameworkBundle/DependencyInjection/Configuration.php     | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index 74f092a3d840c..f806e49746f9c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -329,8 +329,8 @@ private function addWorkflowSection(ArrayNodeDefinition $rootNode)
                                         ->prototype('scalar')
                                             ->cannotBeEmpty()
                                             ->validate()
-                                                ->ifTrue(function ($v) { return !class_exists($v); })
-                                                ->thenInvalid('The supported class %s does not exist.')
+                                                ->ifTrue(function ($v) { return !class_exists($v) && !interface_exists($v); })
+                                                ->thenInvalid('The supported class or interface "%s" does not exist.')
                                             ->end()
                                         ->end()
                                     ->end()