Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/test-346.cs

@@ -0,0 +1,44 @@
+using System;
+
+namespace TestMethods
+{
+	class Class1
+	{
+		public static int Main()
+		{
+			int test_int = 1;
+			TestClass testClass = new TestClass();
+			test_int *= testClass.AddItem (new TestParam());
+			test_int *= testClass.AddItem (new ParamClass());
+
+			int base_int = 1;
+			BaseClass baseClass = testClass as BaseClass;
+			base_int *= baseClass.AddItem (new TestParam());
+			base_int *= baseClass.AddItem (new ParamClass());
+
+			return (test_int == 4 && base_int == 9) ? 0 : 1;
+		}
+	}
+	
+	public class ParamClass {}
+	
+	public class TestParam : ParamClass {}
+	
+	public abstract class BaseClass
+	{
+		public abstract int AddItem (ParamClass val);
+	}
+	
+	public class TestClass : BaseClass
+	{
+		public int AddItem (object val)
+		{
+			return 2;
+		}
+		
+		public override int AddItem (ParamClass val)
+		{
+			return 3;
+		}
+	}
+}