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diff --git a/src/mscorlib/src/System/Runtime/CompilerServices/Unsafe.cs b/src/mscorlib/src/System/Runtime/CompilerServices/Unsafe.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.
+
+using System.Runtime.Versioning;
+
+namespace System.Runtime.CompilerServices
+{
+ //
+ // Subsetted clone of System.Runtime.CompilerServices.Unsafe for internal runtime use.
+ // Keep in sync with https://github.com/dotnet/corefx/tree/master/src/System.Runtime.CompilerServices.Unsafe.
+ //
+
+ /// <summary>
+ /// Contains generic, low-level functionality for manipulating pointers.
+ /// </summary>
+ internal static unsafe class Unsafe
+ {
+ /// <summary>
+ /// Returns a pointer to the given by-ref parameter.
+ /// </summary>
+ [NonVersionable]
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public static void* AsPointer<T>(ref T value)
+ {
+ // The body of this function will be replaced by the EE with unsafe code!!!
+ // See getILIntrinsicImplementationForUnsafe for how this happens.
+ throw new InvalidOperationException();
+ }
+
+ /// <summary>
+ /// Returns the size of an object of the given type parameter.
+ /// </summary>
+ [NonVersionable]
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public static int SizeOf<T>()
+ {
+ // The body of this function will be replaced by the EE with unsafe code that just returns sizeof !!T
+ // See getILIntrinsicImplementationForUnsafe for how this happens.
+ throw new InvalidOperationException();
+ }
+
+ /// <summary>
+ /// Reinterprets the given reference as a reference to a value of type <typeparamref name="TTo"/>.
+ /// </summary>
+ [NonVersionable]
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public static ref TTo As<TFrom, TTo>(ref TFrom source)
+ {
+ // The body of this function will be replaced by the EE with unsafe code!!!
+ // See getILIntrinsicImplementationForUnsafe for how this happens.
+ throw new InvalidOperationException();
+ }
+
+ /// <summary>
+ /// Adds an element offset to the given reference.
+ /// </summary>
+ [NonVersionable]
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public static ref T Add<T>(ref T source, int elementOffset)
+ {
+ // The body of this function will be replaced by the EE with unsafe code!!!
+ // See getILIntrinsicImplementationForUnsafe for how this happens.
+ typeof(T).ToString(); // Type used by the actual method body
+ throw new InvalidOperationException();
+ }
+
+ /// <summary>
+ /// Determines whether the specified references point to the same location.
+ /// </summary>
+ [NonVersionable]
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public static bool AreSame<T>(ref T left, ref T right)
+ {
+ // The body of this function will be replaced by the EE with unsafe code!!!
+ // See getILIntrinsicImplementationForUnsafe for how this happens.
+ throw new InvalidOperationException();
+ }
+ }
+}