[fpc-pascal] optionally uses a unit

[Xiangrong Fang]

Hi All,

Is it possible to optionally use a unit? e.g.

unit myunit;
uses {$ifexists persist.pas}persist,{$endif} Classes;

type
  TMyClass = class
  public
    {$ifexists persist.pas}
    procedure SaveToStream(s: TStream);
    {$endif}
  end;

Thanks,
Xiangrong

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