[Issue 6949] no warning or error if unsigned variable is compared to 0

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6949



--- Comment #3 from Andrej Mitrovic <andrej.mitrovich at gmail.com> 2012-11-29 16:40:59 PST ---
(In reply to comment #2)
> Is Phobos giving some warnings with this patch? More study is
> probably needed.

The autotester is running. It failed once because of this:

enum En : uint
{
    a,   // 0
    b    // triggers comparison
}

I've added a workaround so the warning isn't triggered in this case anymore.
We'll see what the tester says..

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