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    Delphi Error – E2564 Undefined type ‘%s’

    admin November 17, 2022 No Comments

    Delphi Compiler Error

    E2564 Undefined type ‘%s’

    Reason for the Error & Solution

    This occurs when trying to define a type restraint on a generic type using itself. 

    program E2564;

{$APPTYPE CONSOLE}
type
  TRec<T: record> = record
    A: T;
  end;

  TClass = record
    V: TRec<TClass>; //E2564
  end;

begin
end.

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