[fpc-pascal] += property bug?

[Sven Barth]

Michael Van Canneyt <michael at freepascal.org> schrieb am Mi., 14. Aug. 2019,
18:24:

> Basically any operation that requires an address is not allowed.
> That += is using an address is an implementation detail of the compiler.
> Same as Inc() or In/Exclude(). I don't know the exact reason for this
> limitation,
> but it's bound to be a good one, otherwise it would have been lifted a
> long time
> ago...
>

The restriction regarding taking an address was only started to be enforced
in 2.4.0 (see
https://wiki.freepascal.org/User_Changes_2.4.0#Treating_direct-mapped_properties_as_regular_fields)
and further extended to records in 2.6.0 (see
https://wiki.freepascal.org/User_Changes_2.6.0#Taking_the_address_of_fields_of_record_properties
). The idea is to have properties backed by a field and backed by methods
behave identically.

Regards,
Sven

>
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