Scenario from today: I'm looking into fixing some of my old code which uses Windows COM classes. Ideally I'd like to use an existing D COM utility library. But, I can't find any relevant package on code.dlang.org just by searching for COM or Windows. However, if I could use code search then I could simply search for `IUnknown` and that would probably find a bunch of projects which use COM. --- In the end I did find what I was looking for, but only because I had the knowledge that VisualD uses COM: https://github.com/dlang/visuald/blob/e67848ff0388c3c7b06a2f034ecee5723f844ef9/stdext/com.d#L33-L46
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