Imported Upstream version 5.10.0.47

Former-commit-id: d0813289fa2d35e1f8ed77530acb4fb1df441bc0

mcs/tests/test-pattern-10.cs

@@ -0,0 +1,31 @@
+using System;
+
+class X
+{
+	public static int Main ()
+	{
+		Test (null);
+		if (Test ((long) 0) != 1)
+			return 1;
+
+		object o = "aa";
+		if (o != null) {
+			if (o is long s) {
+				Console.WriteLine (s);
+			}
+		} else if (o is string s) {
+			Console.WriteLine (s);
+		}
+
+		return 0;
+	}
+
+	static int Test (object o)
+	{
+		if (o is long s) {
+			return 1;
+		}
+
+		return 0;
+	}
+}