[fpc-devel] is not operator

[Hairy Pixels]

 far more common for me is: if not (xxx in yyy) then. By the same logic it
should be: if xxx not in yyy then

On Sep 11, 2026 at 2:00:47 PM, Mattias Gaertner via fpc-devel <
fpc-devel at lists.freepascal.org> wrote:

> Hi,
>
> I would like to implement the "is not" operator in fpc. It was
> introduced in Delphi 13.
>
> For example:
>
> if Obj is not TStringList then ...
>
> It has the same precedence as "is". Since after "is" there can be only
> an instance, class, interface, etc, and "not" is an all mode keyword,
> I'm not aware of any conflicts or ambiguities - aka it cannot break any
> existing code.
>
> Ok?
>
> Mattias
>
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