HomeDelphiDelphi Error – E2565 Cannot use parameterized or instantiated type as custom attribute

Delphi Error – E2565 Cannot use parameterized or instantiated type as custom attribute

Delphi Compiler Error

E2565 Cannot use parameterized or instantiated type as custom attribute

Reason for the Error & Solution

This occurs when trying to infer RTTI from a generic type.

program E2565;

{$APPTYPE CONSOLE}

uses
  SysUtils;

type
  TMyAttr<T> = class(TCustomAttribute);
  TMyIntegerAttr = TMyAttr<Integer>;

  [TMyIntegerAttr] // E2565
  TBoom = class
  end;

begin
end.

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