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Date: Thu, 31 Dec 2020 04:10:21 -0800 (PST)
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Subject: Re: renames usage
From: John Perry <john.perry@usm.edu>
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Xref: reader02.eternal-september.org comp.lang.ada:60985
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No. Assignment copies the object, and changes to the copy don't affect the original, while renaming obtains a reference to the object. This program will illustrate it:

with Ada.Text_IO; use Ada.Text_IO;

procedure Test_Renames is

   S: String := "hello world";
   T: String := S;
   U: String renames S;

begin

   Put_Line(S);

   T(T'First) := 'y';
   Put_Line(S); -- still "hello world"

   U(U'First) := 'y';
   Put_Line(S); -- "yello world"

end Test_Renames;