Imported Upstream version 5.4.0.167

Former-commit-id: 5624ac747d633e885131e8349322922b6a59baaa

mcs/tests/test-947.cs

@@ -0,0 +1,29 @@
+interface IA
+{
+	int Prop { get; }
+	int this [int arg] { get; }
+}
+
+abstract class B : IA
+{
+    public long Prop => 4;
+
+	int IA.Prop => 1;
+
+	public long this [int arg] => 2;
+
+	int IA.this [int arg] => 4;
+}
+
+class C : B, IA
+{
+	public static void Main ()
+	{
+	}
+
+	public new string Prop {
+		get { return ""; }
+	}
+
+	public new string this [int arg] => "2";
+}