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diff --git a/src/mscorlib/src/System/Runtime/Reliability/PrePrepareMethodAttribute.cs b/src/mscorlib/src/System/Runtime/Reliability/PrePrepareMethodAttribute.cs
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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+//
+/*============================================================
+**
+**
+** Purpose: Serves as a hint to ngen that the decorated method
+** (and its statically determinable call graph) should be
+** prepared (as for Constrained Execution Region use). This
+** is primarily useful in the scenario where the method in
+** question will be prepared explicitly at runtime and the
+** author of the method knows this and wishes to avoid the
+** overhead of runtime preparation.
+**
+**
+===========================================================*/
+namespace System.Runtime.ConstrainedExecution
+{
+ using System;
+ using System.Runtime.InteropServices;
+
+ [AttributeUsage(AttributeTargets.Constructor | AttributeTargets.Method, Inherited = false)]
+
+ public sealed class PrePrepareMethodAttribute : Attribute
+ {
+ public PrePrepareMethodAttribute()
+ {
+ }
+ }
+}