/// [CanBeNull] object Test() => null;
  /// 
  /// void UseTest() {
  ///   var p = Test();
  ///   var s = p.ToString(); // Warning: Possible 'System.NullReferenceException'
  /// }
  /// 
  /// [NotNull] object Foo() {
  ///   return null; // Warning: Possible 'null' assignment
  /// }
  /// 
  /// [StringFormatMethod("message")]
  /// void ShowError(string message, params object[] args) { /* do something */ }
  /// 
  /// void Foo() {
  ///   ShowError("Failed: {0}"); // Warning: Non-existing argument in format string
  /// }
  /// 
  /// void Foo(string param) {
  ///   if (param == null)
  ///     throw new ArgumentNullException("par"); // Warning: Cannot resolve symbol
  /// }
  /// 
  /// public class Foo : INotifyPropertyChanged {
  ///   public event PropertyChangedEventHandler PropertyChanged;
  /// 
  ///   [NotifyPropertyChangedInvocator]
  ///   protected virtual void NotifyChanged(string propertyName) { ... }
  ///
  ///   string _name;
  /// 
  ///   public string Name {
  ///     get { return _name; }
  ///     set { _name = value; NotifyChanged("LastName"); /* Warning */ }
  ///   }
  /// }
  /// 
  /// Examples of generated notifications:
  /// Function Definition Table syntax:
///
  /// [ContractAnnotation("=> halt")]
  /// public void TerminationMethod()
  /// 
  /// [ContractAnnotation("halt <= condition: false")]
  /// public void Assert(bool condition, string text) // regular assertion method
  /// 
  /// [ContractAnnotation("s:null => true")]
  /// public bool IsNullOrEmpty(string s) // string.IsNullOrEmpty()
  /// 
  /// // A method that returns null if the parameter is null,
  /// // and not null if the parameter is not null
  /// [ContractAnnotation("null => null; notnull => notnull")]
  /// public object Transform(object data) 
  /// 
  /// [ContractAnnotation("=> true, result: notnull; => false, result: null")]
  /// public bool TryParse(string s, out Person result)
  /// 
  /// [LocalizationRequiredAttribute(true)]
  /// class Foo {
  ///   string str = "my string"; // Warning: Localizable string
  /// }
  /// 
  /// [CannotApplyEqualityOperator]
  /// class NoEquality { }
  /// 
  /// class UsesNoEquality {
  ///   void Test() {
  ///     var ca1 = new NoEquality();
  ///     var ca2 = new NoEquality();
  ///     if (ca1 != null) { // OK
  ///       bool condition = ca1 == ca2; // Warning
  ///     }
  ///   }
  /// }
  /// 
  /// [BaseTypeRequired(typeof(IComponent)] // Specify requirement
  /// class ComponentAttribute : Attribute { }
  /// 
  /// [Component] // ComponentAttribute requires implementing IComponent interface
  /// class MyComponent : IComponent { }
  /// 
  /// [Pure] int Multiply(int x, int y) => x * y;
  /// 
  /// void M() {
  ///   Multiply(123, 42); // Waring: Return value of pure method is not used
  /// }
  /// 
  /// class Foo {
  ///   [ProvidesContext] IBarService _barService = ...;
  /// 
  ///   void ProcessNode(INode node) {
  ///     DoSomething(node, node.GetGlobalServices().Bar);
  ///     //              ^ Warning: use value of '_barService' field
  ///   }
  /// }
  /// 
  /// [SourceTemplate]
  /// public static void forEach<T>(this IEnumerable<T> xs) {
  ///   foreach (var x in xs) {
  ///      //$ $END$
  ///   }
  /// }
  /// 
  /// 
  /// [SourceTemplate, Macro(Target = "item", Expression = "suggestVariableName()")]
  /// public static void forEach<T>(this IEnumerable<T> collection) {
  ///   foreach (var item in collection) {
  ///     //$ $END$
  ///   }
  /// }
  /// 
  /// Applying the attribute on a template method parameter:
  /// 
  /// [SourceTemplate]
  /// public static void something(this Entity x, [Macro(Expression = "guid()", Editable = -1)] string newguid) {
  ///   /*$ var $x$Id = "$newguid$" + x.ToString();
  ///   x.DoSomething($x$Id); */
  /// }
  /// 
  /// 
  /// [ActionName("Foo")]
  /// public ActionResult Login(string returnUrl) {
  ///   ViewBag.ReturnUrl = Url.Action("Foo"); // OK
  ///   return RedirectToAction("Bar"); // Error: Cannot resolve action
  /// }
  ///