From 945f23602b6ffa440669d1eec3d8d9367d3422e9 Mon Sep 17 00:00:00 2001
From: Nicolas Appriou <nicolas.appriou@gmail.com>
Date: Thu, 14 Dec 2017 10:22:00 +0100
Subject: [PATCH] improve FormType::getType exception message details

---
 src/Symfony/Component/Form/FormRegistry.php | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/Symfony/Component/Form/FormRegistry.php b/src/Symfony/Component/Form/FormRegistry.php
index 7da3d2ceb6..8df65de87b 100644
--- a/src/Symfony/Component/Form/FormRegistry.php
+++ b/src/Symfony/Component/Form/FormRegistry.php
@@ -84,11 +84,14 @@ class FormRegistry implements FormRegistryInterface
 
             if (!$type) {
                 // Support fully-qualified class names
-                if (class_exists($name) && in_array('Symfony\Component\Form\FormTypeInterface', class_implements($name))) {
-                    $type = new $name();
-                } else {
-                    throw new InvalidArgumentException(sprintf('Could not load type "%s"', $name));
+                if (!class_exists($name)) {
+                    throw new InvalidArgumentException(sprintf('Could not load type "%s": class does not exist.', $name));
                 }
+                if (!in_array(FormTypeInterface::class, class_implements($name))) {
+                    throw new InvalidArgumentException(sprintf('Could not load type "%s": class does not implement "%s".', $name, FormTypeInterface::class));
+                }
+
+                $type = new $name();
             }
 
             $this->resolveAndAddType($type);