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[Dicebot via Digitalmars-d]

> For instance, this code compiles and runs just fine.
>
>     void main()
>     {
>         auto i = new immutable int(5);
>         assert(*i == 5);
>         auto j = cast(int*)i;
>         *j = 42;
>         assert(*i == 42);
>     }

AFAIK this is UB already (in practice), you will get different 
results depending on compiler and optimization flags.