Anonymous Method constraints

Anonymous Method constraints
Due to the occasional shooting of foot due to how capture works, I wish there was a way of optionally constraining references for an anonymous method, so that I could enforce local references only.

type
  TFilterMethod = constrained reference to function (const Item:T):Boolean;

  TInstanceList = class
    property function Filtered(Filter: TFilterMethod):TInstanceList;
  end;

var
  SomeRef: TQualifier;
  List: TInstanceList;
  Element: TThing;
begin
  ...
  // compiles
  for Element in List.Filtered(function (Item: TThing)
    begin
      Result := Item.Qualifier in [This, That]);
    end)
  do begin
    ...

  // should not compile - but error on "reference outside method not allowed for constrained methods
  for Element in List.Filtered(function (Item: TThing)
    begin 
      Result := (Item.Qualifier = SomeRef);
    end)
  do begin
    ...