From 6c7d03431c07ef33b62be5b5141ca151a843e8a1 Mon Sep 17 00:00:00 2001
From: Nicolas Grekas <nicolas.grekas@gmail.com>
Date: Thu, 24 Jan 2019 19:14:26 +0100
Subject: [PATCH] [Mime] fix adding extensions when creating a MimeTypes
 instance

---
 src/Symfony/Component/Mime/MimeTypes.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/Symfony/Component/Mime/MimeTypes.php b/src/Symfony/Component/Mime/MimeTypes.php
index aa27c3d8c9..4d5c944f86 100644
--- a/src/Symfony/Component/Mime/MimeTypes.php
+++ b/src/Symfony/Component/Mime/MimeTypes.php
@@ -34,13 +34,14 @@ namespace Symfony\Component\Mime;
  */
 final class MimeTypes implements MimeTypesInterface
 {
+    private $extensions = [];
     private $guessers = [];
     private static $default;
 
     public function __construct(array $map = [])
     {
         foreach ($map as $mimeType => $extensions) {
-            self::$extensions[$mimeType] = $extensions;
+            $this->extensions[$mimeType] = $extensions;
         }
         $this->registerGuesser(new FileBinaryMimeTypeGuesser());
         $this->registerGuesser(new FileinfoMimeTypeGuesser());
@@ -71,7 +72,7 @@ final class MimeTypes implements MimeTypesInterface
      */
     public function getExtensions(string $mimeType): array
     {
-        return self::$map[$mimeType] ?? [];
+        return $this->extensions[$mimeType] ?? self::$map[$mimeType] ?? [];
     }
 
     /**