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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.lang.c
Subject: Re: Recursion, Yo
Date: Wed, 17 Apr 2024 22:12:25 -0000 (UTC)
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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 ...