From b82f301b0546831094a60f01ce294eaf39a591ff Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gabriel=20Ostroluck=C3=BD?=
 <gabriel.ostrolucky@everlution.sk>
Date: Sun, 3 Dec 2017 23:37:47 +0100
Subject: [PATCH] [Serializer] Parse PHP constants in YAML mappings

---
 .../Component/Serializer/Mapping/Loader/YamlFileLoader.php     | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php b/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php
index 970241d347..45c0811185 100644
--- a/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php
@@ -15,6 +15,7 @@ use Symfony\Component\Serializer\Exception\MappingException;
 use Symfony\Component\Serializer\Mapping\AttributeMetadata;
 use Symfony\Component\Serializer\Mapping\ClassMetadataInterface;
 use Symfony\Component\Yaml\Parser;
+use Symfony\Component\Yaml\Yaml;
 
 /**
  * YAML File Loader.
@@ -113,7 +114,7 @@ class YamlFileLoader extends FileLoader
             $this->yamlParser = new Parser();
         }
 
-        $classes = $this->yamlParser->parseFile($this->file);
+        $classes = $this->yamlParser->parseFile($this->file, Yaml::PARSE_CONSTANT);
 
         if (empty($classes)) {
             return array();