On Sat, 7 Mar 2026, Martin Frb via fpc-devel wrote:
https://gitlab.com/freepascal.org/fpc/source/-/work_items/41642#note_3135425124
That's actually a FPC compiler bug:
procedure WriteProperty(Path: String; Instance: TObject;
PropInfo: Pointer; DefInstance: TObject = nil;
const OnlyProperty: array of String);
then what is the correct syntax?
The link suggests there needs to be a default value for OnlyProperty (and I
would have expected that too).
But FPC does reject *any* default. It reject the = sign itself, if any is
added.
So what is the correct syntax?
As I wrote in the ticket you refer to, it's a bug in FPC, which is
formalized in this ticket:
https://gitlab.com/freepascal.org/fpc/source/-/work_items/41644
I would expect - when the bug is corrected - that the syntax is "= Nil"
For the time being, I suggest you use an overload.
Michael.
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