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-rw-r--r--src/DotNetOpenAuth.Core/Messaging/EnumerableCacheExtensions.cs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.Core/Messaging/EnumerableCacheExtensions.cs b/src/DotNetOpenAuth.Core/Messaging/EnumerableCacheExtensions.cs
index 5e9cf93..f5c4b36 100644
--- a/src/DotNetOpenAuth.Core/Messaging/EnumerableCacheExtensions.cs
+++ b/src/DotNetOpenAuth.Core/Messaging/EnumerableCacheExtensions.cs
@@ -10,6 +10,7 @@ namespace DotNetOpenAuth.Messaging {
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
+ using Validation;
/// <summary>
/// Extension methods for <see cref="IEnumerable&lt;T&gt;"/> types.