1 files changed, 18 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Runtime/CompilerServices/IsLong.cs b/src/mscorlib/src/System/Runtime/CompilerServices/IsLong.cs
new file mode 100644
index 0000000000..e8bebfb2d3
--- /dev/null
+++ b/src/mscorlib/src/System/Runtime/CompilerServices/IsLong.cs
@@ -0,0 +1,18 @@
+// 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.
+
+namespace System.Runtime.CompilerServices
+{
+    // The C++ standard indicates that a long is always 4-bytes, whereas the
+    // size of an integer is system dependent (not exceedign sizeof(long)).
+    // The CLR does not offer a mechanism for encoding this distinction,
+    // but it is critically important for maintaining language level type
+    // safety.
+    //
+    // Indicates that the modified integer is a standard C++ long.
+    // Could also be called IsAlternateIntegerType or something else.
+    public static class IsLong
+    {
+    }
+}