How do you properly use immutable on class members?

[Salih Dincer]

On Tuesday, 29 March 2022 at 19:26:51 UTC, Ali Çehreli wrote:
>
> Better yet, and as I know you know :), and as it comes up 
> occasionally but I usually forget in my own code; 'in' is much 
> better than 'const' on function parameters because it has super 
> powers when compiled with -preview=in:
>

Hello to everyone.

I think const is a redundant thing. Can you show me a direct 
side-effect that happens when we don't use const?

SDB at 79