[Issue 9978] Can override interface function

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9978



--- Comment #2 from Damian <damianday at hotmail.co.uk> 2013-04-22 11:03:58 PDT ---
(In reply to comment #1)
> I would tend to think this is allowed.  Imagine if you switched an interface to
> an abstract base class or vice versa, you wish to make someone go through all
> their calls and add/remove override?
> 
> I had a bug fixed a long time ago, issue 2524.
> 
> In a comment, Walter said:
> 
> "This is a compiler bug. You can override an interface function."
> 
> I'm assuming this still applies today.

That's precisely what I was doing when I stumbled upon this, changing a
abstract class to a interface. I'm not sure why both are allowed, even though
it does no harm to keep both, it seems one should be the right way and the
other a warning possibly?

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