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From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
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Subject: Re: advent of code day 11
Date: Fri, 11 Dec 2020 20:07:06 +0100
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On 12/11/20 7:24 PM, John Perry wrote:
> 
>     Source: Chart_Array renames Chart1;
>     Result: Chart_Array renames Chart2;
> 
>     while Changed loop
> 
>        Perform_Round( Source => Source , Result => Result , ... );
>        declare Tmp: Chart_Array renames Source;
>        begin
>           Source := Result;
>           Result := Tmp;

Renaming simply creates an additional way to name something. This should be the 
same as

    Chart1 := Chart2;
    Chart2 := Chart1;

-- 
Jeff Carter
"[I]f we should ever separate, my little plum,
I want to give you one little bit of fatherly advice. ... Never
give a sucker an even break."
Poppy
97