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Date: Thu, 7 Jan 2021 02:38:19 -0800 (PST)
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Subject: Re: Lower bounds of Strings
From: Stephen Davies <joviangm@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:61053
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Stephen Davies wrote: 
> subtype Mono_String is String (1 .. <>);
> subtype Mono_String is String with First => 1;
> subtype Mono_String is String with Slide => True;

Dmitry A. Kazakov wrote:
> Position-based indices an slices. One could add [] brackets for that 
> stuff to make C crowd happy. 
> S [1] - First array element 
> S (1) - Array element at index 1 

Alternatively, to make the distinction more explicit, perhaps:
S[Slide:1] - First array element

Or maybe a new attribute:
S'Slide(1)

Reminder, my justification is not only for strings being indexed by
numeric literals, e.g.:
subtype Some_Range is Positive range 4..5;
...
Some_String(Some_Range) -- fails if Some_String'First /= 1