Imported Upstream version 5.4.0.167

Former-commit-id: 5624ac747d633e885131e8349322922b6a59baaa

mcs/tests/test-pattern-01.cs

@@ -1,5 +1,3 @@
-// Compiler options: -langversion:experimental
-
 using System;
 
 class TypePattern
@@ -8,31 +6,14 @@ class TypePattern
 	{
 		object o = 3;
 		bool r = o is System.String t1;
-		if (t1 != null)
-			return 1;
-
 		if (r)
 			return 2;
 
 		if (o is string t2)
 			return 3;
 
-		if (t2 != null)
-			return 4;
-
-		object o2 = (int?) 4;
-		bool r2 = o2 is byte? t3;
-
-		if (t3 != null)
-			return 5;
-
-		if (r2)
-			return 6;
-
 		long? l = 5;
 		bool r3 = l is long t4;
-		if (t4 != 5)
-			return 7;
 
 		if (!r3)
 			return 8;
@@ -40,4 +21,22 @@ class TypePattern
 		Console.WriteLine ("ok");
 		return 0;
 	}
+
+	static void Test1 (object arg)
+	{
+		while (arg is int b) {
+			b = 2;
+		}
+	}
+
+	static string Test2 (object arg)
+	{
+		if (arg is string s) {
+			return s;
+		} else {
+			s = "";
+		}
+		
+		return s;
+	}
 }