[Issue 3731] Immutable class may be changed when inherits from mutable parent

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3731



--- Comment #2 from Tomasz Sowiński <tomeksowi at gmail.com> 2010-01-21 11:03:00 PST ---
(In reply to comment #1)
> The solution would be to make it illegal to have a mutable class reference to
> the base class.
> 
> In your example, this line should be an error:
> 
> Zmienna zm = st; // error, must use immutable(Zmienna) or const(Zmienna)

Thanks, that makes sense.

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