Why the need for an only const ref?

[Janice Caron]

On 12/2/07, Janice Caron <caron800 at googlemail.com> wrote:
>     f(Buffer b)
>     {
>         buffer ~= "abc"; // Error
>     }

     f(Buffer b)
     {
         b.buffer ~= "abc"; // Also error :-)
     }