E2527 Helper type '%s' cannot be used in declarations (Delphi)

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This occurs when you try to use a helper record as a stand-alone type.

program E2527;

{$APPTYPE CONSOLE}

uses
  SysUtils;

type
  TMyRecord = record
    Field: string;
  end;

  TMyRecordHelper = record helper for TMyRecord
  end;

var a:TMyRecordHelper; //E2527
begin
  Writeln('E2527 Helper type ''%s'' cannot be used in declarations');
end.