Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/gtest-326-lib.cs

@@ -0,0 +1,32 @@
+// Compiler options: /t:library
+using System;
+using SCG = System.Collections.Generic;
+
+namespace C5
+{
+	public abstract class EnumerableBase<T> : SCG.IEnumerable<T>
+	{
+		public abstract SCG.IEnumerator<T> GetEnumerator ();
+
+		System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
+		{
+			return GetEnumerator();
+		}
+	}
+
+	public class ArrayBase<T> : EnumerableBase<T>
+	{
+		public override SCG.IEnumerator<T> GetEnumerator ()
+		{
+			yield break;
+		}
+	}
+
+	public class ArrayList<T> : ArrayBase<T>
+	{
+		public override SCG.IEnumerator<T> GetEnumerator ()
+		{
+			return base.GetEnumerator ();
+		}
+	}
+}