Imported Upstream version 3.12.0

Former-commit-id: cf92446697332992ec36726e78eb8703e1f259d7

mcs/tests/test-pattern-02.cs

@@ -0,0 +1,93 @@
+// Compiler options: -langversion:experimental
+
+using System;
+
+enum MyEnum : short
+{
+	V_4 = 4
+}
+
+class ConstantPattern
+{
+	static bool Generic<T> (T t) where T : class
+	{
+		return t is default (T);
+	}
+
+	public static int Main ()
+	{
+		bool b4 = false;
+		b4 = !b4;
+		object o = "x";
+		bool r1 = o is "y";
+		if (r1)
+			return 1;
+
+		r1 = o is "x";
+		if (!r1)
+			return 2;
+
+		string s = "o";
+		if (s is null)
+			return 3;
+
+		if (s is "oo")
+			return 4;
+
+		if (!(s is "o"))
+			return 5;
+
+		int? o3 = 4;
+		bool r3 = o3 is null;
+		if (r3)
+			return 6;
+		
+		r3 = o3 is 4;
+		if (!r3)
+			return 7;
+
+		object o4 = (byte?)255;
+		var ggg = o4 is 255;
+		if (!ggg)
+			return 8;
+
+		if (o4 is null)
+			return 9;
+
+		object o5 = (double)-255;
+		if (!(o5 is -byte.MaxValue))
+			return 10;
+
+		object o6 = MyEnum.V_4;
+		bool r4 = o6 is 4;
+		if (r4)
+			return 11;
+
+		r4 = o6 is MyEnum.V_4;
+		if (!r4)
+			return 12;
+
+		ConstantPattern o7 = new ConstantPattern ();
+		if (!(o7 is ConstantPattern))
+			return 13;
+
+		if (!(o7 is object))
+			return 14;
+
+		object o8 = true;
+		if (o8 is false)
+			return 15;
+
+		if (!(o8 is true))
+			return 16;
+
+		if (Generic (""))
+			return 17;
+
+		if (!Generic<Delegate> (null))
+			return 18;
+
+		Console.WriteLine ("ok");
+		return 0;
+	}
+}