Imported Upstream version 3.12.0

Former-commit-id: cf92446697332992ec36726e78eb8703e1f259d7

mcs/tests/test-pattern-06.cs

@@ -0,0 +1,68 @@
+// Compiler options: -langversion:experimental
+
+using System;
+
+class RecursiveNamedPattern
+{
+	public static int Main ()
+	{
+		if (Switch_1 (null) != 4)
+			return 1;
+
+		if (Switch_1 ("x") != 5)
+			return 2;
+
+		if (Switch_1 (1) != 1)
+			return 3;
+
+		if (Switch_1 (new C1 ()) != 3)
+			return 4;
+
+		if (Switch_1 ((byte?) 1) != 1)
+			return 5;
+
+		if (Switch_2 (new C1 ()) != 3)
+			return 10;
+
+		if (Switch_2 (null) != 2)
+			return 11;
+
+		Console.WriteLine ("ok");
+		return 0;
+	}
+
+	static int Switch_1 (object o)
+	{
+		switch (o) {
+			case 1:
+				return 1;
+			case C1 (3):
+				return 2;
+			case C1 (2):
+				return 3;
+			case null:
+				return 4;
+			default:
+				return 5;
+		}
+	}
+
+	static int Switch_2 (C1 o)
+	{
+		switch (o) {
+			case null:
+				return 2;
+		}
+
+		return 3;
+	}
+}
+
+public class C1
+{
+	public static bool operator is (C1 c1, out int i)
+	{
+		i = 2;
+		return true;
+	}
+}