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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: ADA.STRINGS.INDEX_ERROR : a-strunb.adb:782
Date: Thu, 18 Jan 2018 19:10:42 -0600
Organization: JSA Research & Innovation
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Xref: reader02.eternal-september.org comp.lang.ada:49989
Date: 2018-01-18T19:10:42-06:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message 
news:p3qe4m$t5n$1@gioia.aioe.org...
> On 18/01/2018 14:08, J-P. Rosen wrote:
>
>> If the user were allowed to define identifiers with a quote, these would
>> not be true any more, and there would be no benefit in using a
>> distinctive syntax.
>
> As if there were any benefit of.

The benefit is that these things can express ideas that aren't possible for 
ordinary subprogram calls. To express Subtype'First as a function, one would 
have to have some sort of meta-type (a subtype parameter). You'd also have 
to allow "univeral_integer" and the like as expressible data types (meaning 
that you'd have to decide what they mean at runtime). All things that could 
be done -- in a new language -- but it would be extremely difficult to 
define such things and keep compatibility with existing Ada.

                          Randy.