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From: Janis Papanagnou <janis_papanagnou+ng@hotmail.com>
Newsgroups: comp.lang.c
Subject: Re: Recursion, Yo
Date: Mon, 22 Apr 2024 18:06:53 +0200
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On 18.04.2024 00:12, Lawrence D'Oliveiro wrote:
> On Wed, 17 Apr 2024 18:09:06 +0100, Ben Bacarisse wrote:
> 
>> Lawrence D'Oliveiro <ldo@nz.invalid> writes:
>>
>>> On Mon, 15 Apr 2024 17:50:45 +0100, Ben Bacarisse wrote:
>>>
>>>> Algol 68 has no denotation for the empty value.
>>>
>>> Section 8.1.5.1 of the Revised Report:
>>>
>>>     void denotation : empty symbol.
>>
>> Thanks.  If I had ever known that, I had forgotten.  It's almost never
>> used because values are coerced to void all the contexts where it might
>> be otherwise required.  I'm pretty sure I've never written it.
> 
> I also did a quick test in a68g that “BEGIN EMPTY END” is a valid program 
> (at least compiles without errors). But the last time I posted such a 
> thing, someone claimed that a68g was not necessarily a fully conforming 
> Algol 68 implementation ...

I don't see why it shouldn't be valid program; I mean you can write
programs like "BEGIN END", "BEGIN EMPTY END", "BEGIN SKIP END",
"BEGIN NIL END", "BEGIN 3.14 END", or, "BEGIN 42 END".
I wouldn't expect that these do anything; only in the latter cases
I'd at least see a point in returning that value to the environment
(which isn't done, though, with the Genie compiler).

Janis