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-rw-r--r--src/DotNetOpenAuth.Messaging/Util.cs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/DotNetOpenAuth.Messaging/Util.cs b/src/DotNetOpenAuth.Messaging/Util.cs
index d6f8f23..6b63a36 100644
--- a/src/DotNetOpenAuth.Messaging/Util.cs
+++ b/src/DotNetOpenAuth.Messaging/Util.cs
@@ -209,7 +209,7 @@ namespace DotNetOpenAuth {
/// <param name="obj">The object that may be serialized to string form.</param>
/// <param name="toString">The method that will serialize the object if called upon.</param>
public DelayedToString(T obj, Func<T, string> toString) {
- Contract.Requires<ArgumentNullException>(toString != null);
+ Requires.NotNull(toString, "toString");
this.obj = obj;
this.toString = toString;