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E2570 Local procedure in generic method or method of generic type is not supported (Object Pascal)

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This happens when you use a local function or procedure inside a generic type.


program E2570;
{E2570 Local procedure in generic method or method of generic type is not supported}

{$APPTYPE CONSOLE}

type
  TMyClass = class
  public
    procedure MyMethod<T>(A: T);
  end;

procedure TMyClass.MyMethod<T>(A: T);

  procedure NotAllowed(B: T); //E2570
  begin
  end;

begin
  NotAllowed(A);
end;

begin
end.
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