[mcs] null propagating operator on index expressions

1 files changed, 58 insertions, 0 deletions

diff --git a/mcs/tests/test-null-operator-05.cs b/mcs/tests/test-null-operator-05.cs
new file mode 100644
index 00000000000..5fa5c6ff9b4
--- /dev/null
+++ b/mcs/tests/test-null-operator-05.cs
@@ -0,0 +1,58 @@
+using System;
+
+class CI
+{
+	public string this [string i] { set { } get { return ""; } }
+	public int? this [int i] { set { } get { return 1; } }
+}
+
+class C
+{
+	static int TestArrayAccess ()
+	{
+		byte[] arr = null;
+		var v = arr? [0];
+		if (v != null)
+			return 1;
+
+		long?[] ar2 = null;
+		var v2 = ar2? [-1];
+		if (v2 != null)
+			return 2;
+
+// TODO: Disabled for now?
+//        arr? [0] += 2;
+		return 0;
+	}
+
+	static int TestIndexerAccess ()
+	{
+		CI ci = null;
+		var v = ci? ["x"];
+		if (v != null)
+			return 1;
+
+		var v2 = ci? [0];
+		if (v2 != null)
+			return 2;
+
+// TODO: Disabled for now?
+//       ci? [0] += 3;
+		return 0;
+	}
+
+	static int Main ()
+	{
+		int res;
+		res = TestArrayAccess ();
+		if (res != 0)
+			return 10 + res;
+
+		res = TestIndexerAccess ();
+		if (res != 0)
+			return 20 + res;
+
+		Console.WriteLine ("ok");
+		return 0;
+	}
+}
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