Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/errors/cs0728-3.cs

@@ -0,0 +1,14 @@
+// CS0728: Possibly incorrect assignment to `s' which is the argument to a using or lock statement
+// Line: 12
+// Compiler options: -warnaserror
+
+public class Foo
+{
+	public static void Test (ref string s)
+	{
+		lock (s) {
+			lock (s) {}
+			s = null;
+		}
+	}
+}