1 files changed, 17 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..df16be8648
--- /dev/null
+++ b/src/mscorlib/src/System/Runtime/CompilerServices/IsLong.cs
@@ -0,0 +1,17 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license 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
+    {
+    }
+}