The slot mechanism I'm adding in bug 1776522 introduces clear semantics for IDL bindings for different languages. Once that lands, we should make searchfox explicitly aware of the rust bindings. This very potentially ties into bug 1727789 about semantic linking, particularly if the simplest thing is to move to having the XPIDL code generator emit the analysis data directly instead of having searchfox's in-searchfox-tree idl-analyze.py do it. I believe there is some discussion in https://chat.mozilla.org/#/room/#xpcom:mozilla.org backscroll where I'd noted some observations about naming conventions we might be able to leverage, but it's likely worth consulting freshly in there once we reach that point.