1 files changed, 16 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/Collections/Generic/IReadOnlyList.cs b/src/mscorlib/shared/System/Collections/Generic/IReadOnlyList.cs
new file mode 100644
index 0000000000..00b5be65ff
--- /dev/null
+++ b/src/mscorlib/shared/System/Collections/Generic/IReadOnlyList.cs
@@ -0,0 +1,16 @@
+// 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;
+using System.Diagnostics.Contracts;
+using System.Runtime.CompilerServices;
+
+namespace System.Collections.Generic
+{
+    // Provides a read-only, covariant view of a generic list.
+    public interface IReadOnlyList<out T> : IReadOnlyCollection<T>
+    {
+        T this[int index] { get; }
+    }
+}