[Issue 5097] Safer unions with @tagged

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5097



--- Comment #3 from Andrei Alexandrescu <andrei at metalanguage.com> 2010-10-21 20:27:47 PDT ---
(In reply to comment #2)
> (In reply to comment #1)
> > This is not the same as std.variant.Algebraic because:
> > - There is no way for the programmer to read the tag, because the tag and its
> > tests vanish in release mode.
> 
> This does not justify a new language feature. Anyone could define a private tag
> that doesn't vanish in release mode.

Oops, I meant "does".

Andrei

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