1 files changed, 15 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Runtime/CompilerServices/IsSignUnspecifiedByte.cs b/src/mscorlib/src/System/Runtime/CompilerServices/IsSignUnspecifiedByte.cs
new file mode 100644
index 0000000000..8249b26410
--- /dev/null
+++ b/src/mscorlib/src/System/Runtime/CompilerServices/IsSignUnspecifiedByte.cs
@@ -0,0 +1,15 @@
+// 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
+{
+    // C++ recognizes three char types: signed char, unsigned char, and char.
+    // When a char is neither signed nor unsigned, it is a char.
+    // This modopt indicates that the modified instance is a char.
+    //
+    // Any compiler could use this to indicate that the user has not specified
+    // Sign behavior for the given byte.
+    public static class IsSignUnspecifiedByte 
+    {
+    }
+}