Imported Upstream version 3.12.0

Former-commit-id: cf92446697332992ec36726e78eb8703e1f259d7

mcs/tests/test-pattern-04.cs

@@ -0,0 +1,77 @@
+// Compiler options: -langversion:experimental
+
+using System;
+
+class RecursivePattern
+{
+	static int Main ()
+	{
+		object o = null;
+		bool b = o is C1 (8);
+		if (b)
+			return 1;
+
+		o = new C1 ();
+		b = o is C1 (-4);
+		if (b)
+			return 2;
+
+		b = o is C1 (8);
+		if (!b)
+			return 3;
+
+		b = o is C1 (C1 (9), C1 (8));
+		if (b)
+			return 4;
+
+		b = o is C1 (C1 (*), C1 (8));
+		if (!b)
+			return 41;
+
+		b = o is C1 (0);
+		if (b)
+			return 5;
+
+		ValueType vt = new S ();
+		b = vt is S (null, 0);
+		if (b)
+			return 6;
+
+		b = vt is S (8, 0);
+		if (b)
+			return 7;
+
+		b = vt is S (8, 2);
+		if (!b)
+			return 8;
+
+		Console.WriteLine ("ok");
+		return 0;
+	}
+}
+
+class C1
+{
+	public static bool operator is (C1 c, out int x)
+	{
+		x = 8;
+		return true;
+	}
+
+	public static bool operator is (C1 c, out C1 c2, out C1 c3)
+	{
+		c2 = null;
+		c3 = null;
+		return true;
+	}
+}
+
+struct S
+{
+	public static bool operator is (S s, out int? x, out decimal d)
+	{
+		x = 8;
+		d = 2;
+		return true;
+	}
+}