Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/errors/cs0184-6.cs

@@ -0,0 +1,17 @@
+// CS0184: The given expression is never of the provided (`Y') type
+// Line: 10
+// Compiler options: -warnaserror -warn:1
+
+class Y
+{
+}
+
+class X
+{
+	public void Foo ()
+	{
+		X x = null;
+		if (x is Y) {
+		}
+	}
+}