Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/test-310.cs

@@ -0,0 +1,39 @@
+namespace test
+{
+
+	interface IIntf1
+	{
+		string GetType(int index);
+	}
+	
+	interface IIntf2: IIntf1
+	{
+		bool IsDone();
+	}
+	
+	class Impl: IIntf2
+	{
+		public string GetType(int index)
+		{
+			return "none";
+		}
+		
+		public bool IsDone()
+		{
+			return true;
+		}
+	}
+
+	class myclass
+	{ 
+	
+	  public static void Main(string[] args)
+	  {
+	    IIntf1 intf = new Impl();
+	    IIntf2 intf2 = intf as IIntf2;
+	    if (intf2 != null) {
+	    	string str = intf2.GetType(0);	    
+	    }	  
+	  }
+	}
+}