http://d.puremagic.com/issues/show_bug.cgi?id=11175

           Summary: format prints null for all objects inheriting IUnknown
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: critical
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: andrej.mitrovich@gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-10-05 11:15:15 PDT ---
This really had me stumped:

-----
import std.stdio;

interface IWhatever { }
class C : IWhatever { }

interface IUnknown { }
class D : IUnknown { }

void main()
{
    IWhatever iw = new C;
    writefln("iw is: %s. iw is not null: %s", iw, iw !is null);

    IUnknown iu = new D;
    writefln("iu is: %s. iu is not null: %s", iu, iu !is null);
}
-----

Prints:

iw is: test.C. iw is not null: true
iu is: null. iu is not null: true

What in the world??

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http://d.puremagic.com/issues/show_bug.cgi?id=11175



--- Comment #1 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-10-05 11:22:38 PDT ---
I don't even see any special code handling in Phobos that would cause this. It seems like a compiler issue?

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