C# 8.0 のnull許容参照型を有効化

[opentween/open-tween.git] / OpenTween / Thumbnail / Services / Youtube.cs

diff --git a/OpenTween/Thumbnail/Services/Youtube.cs b/OpenTween/Thumbnail/Services/Youtube.cs
index 261fa13..181f8a5 100644 (file)
--- a/OpenTween/Thumbnail/Services/Youtube.cs
+++ b/OpenTween/Thumbnail/Services/Youtube.cs
@@ -24,6 +24,8 @@
 // the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
 // Boston, MA 02110-1301, USA.
 
+#nullable enable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -41,7 +43,7 @@ namespace OpenTween.Thumbnail.Services
         public static readonly Regex UrlPatternRegex =
             new Regex(@"^https?://(?:((?:www|m)\.youtube\.com)|(youtu\.be))/(watch\?v=)?(?<videoid>([\w\-]+))");
 
-        public override Task<ThumbnailInfo> GetThumbnailInfoAsync(string url, PostClass post, CancellationToken token)
+        public override Task<ThumbnailInfo?> GetThumbnailInfoAsync(string url, PostClass post, CancellationToken token)
         {
             return Task.Run(() =>
             {