Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/test-iter-04.cs

@@ -0,0 +1,21 @@
+// Compiler options: -langversion:default
+
+using System;
+using System.Collections;
+
+class X {
+	static IEnumerable GetRange (int start, int end)
+	{
+		for (int i = start; i < end; i++)
+			yield return i;
+	}
+
+	public static void Main ()
+	{
+		Console.WriteLine ("GetRange 10..20");
+				   
+		foreach (int i in GetRange (10, 20)){
+			Console.WriteLine ("i=" + i);
+		}
+	}
+}