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Newsgroups: comp.lang.ada
Date: Sat, 26 May 2018 16:55:34 -0700 (PDT)
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Subject: Re: why "unconstrained subtype in component declaration" while said
 component given default value ?
From: Jere <jhb.chat@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:52710
Date: 2018-05-26T16:55:34-07:00
List-Id: <comp.lang.ada>

On Saturday, May 26, 2018 at 6:11:13 PM UTC-4, Mehdi Saada wrote:
> But isn't the situation the same in automatic variables, with arrays whose constraint is only known at run time ? Like this:
> procedure Main is
>    subtype Pos_Little is Positive range 1..56;
>    package Num_Gen is new Ada.Numerics.Discrete_Random (Pos_Little);
>    Gen : Num_Gen.Generator;
> begin
>    declare
>       Arr : array (1..Num_Gen.Random(Gen)) of Positive;
>    begin
>       null;
>    end;
> end Main;
> Yet this case is legal.

Record types need to support Representation Clauses, where as normal 
variables do not.