The thing is that scope completion shows tags only from a single file (so e.g. only members of a single anon_struct_0 are shown). Namespaces can span multiple files and then you'd get members from just a single (more or less random) file which might look strange. So I skipped namespaces.
It probably is fixable but it would probably be a little more work so I'd skip it for now.
Okay, get it. Maybe in the end it'd require a special case to allow results for namespaces to span multiple files or something. But ok, we can leave it like this for now and keep further improvements for later too :)
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