Which language elements can be annotated using attributes language feature of Delphi?
procedure Request([FormParam] AUsername: string; [FormParam] APassword: string);

program Project25;

{$APPTYPE CONSOLE}

uses
  Rtti;

type
  TestAttribute = class(TCustomAttribute);

  [TestAttribute] TEnum = (first, second, third);
  [TestAttribute] TFunc = function: Integer;
  [TestAttribute] TEvent = procedure of object;
  [TestAttribute] AliasInteger = Integer;

  [TestAttribute] ARecord = record
    x:Integer;
    [TestAttribute] RecordField: Integer;
    [TestAttribute] procedure DummyProc;
  end;

  [TestAttribute] AClass = class
  strict private
    type [TestAttribute] InnerType = record y:Integer; end;
  private
    [TestAttribute]
    function GetTest: Integer;
  public
    [TestAttribute] x: Integer;
    [TestAttribute] class var z: Integer;
    // Can't find a way to declare attribute for property!
    property Test:Integer read GetTest;
    [TestAttribute] class function ClassFuncTest:Integer;
  end;

var [TestAttribute] GlobalVar: Integer;

[TestAttribute]
procedure GlobalFunction;
var [TestAttribute] LocalVar: Integer;
begin
end;

{ ARecord }

procedure ARecord.DummyProc;
begin
end;

{ AClass }

class function AClass.ClassFuncTest: Integer;
begin
end;

function AClass.GetTest: Integer;
begin
end;

begin
end.