[Oberon] Bit-fiddling: SETs and type casts in Oberon-07

[Chris Burrows]

On Tue, Aug 9, 2022 at 8:37 AM Hans Klaver <hklaver at dds.nl> wrote:

> Concerning this I found out that only OBNC requires a variable as first
> parameter of EXCL and INCL, and disallows SYSTEM.VAL in its place; Wirth's
> OR and the Astrobe compiler have no problem with SYSTEM.VAL as first
> parameter of these procedures. So for instance they accept the following
> (Astrobe with a warning 'type cast !'):
>
>   VAR i: INTEGER;
>   ...
>   EXCL(SYSTEM.VAL(SET, i), 5)
>   RETURN i
>
>
However, the Astrobe compiler does not always generate correct code for
this type of example. Following the reasoning in my previous posts on this
subject I have decided to report this (and any use of SYSTEM.VAL passed to
a VAR parameter of a procedure) as an error in the next release of the
Astrobe compilers.

Regards,
Chris Burrows
CFB Software
https://www.astrobe.com
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