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There's this comment in directory.c:

      /* XXX+++++ Not all bridges handle conditional consensus downloading,
       * so, for now, never assume the server supports that. -PP
       * Is that assumption still so in 2016? -NM */

And you're right, the conditional consensus stuff has been in since Tor 0.2.1.x.

So I went to go rip out the special-casing code, but it already got ripped out in git commit 7988596f (which went into Tor 0.2.4.2-alpha).

And then, inexplicably, I seem to have added the stanza back in during git commit a8297cdbd3 (which went into Tor 0.2.4.11-alpha).

I just looked around at the code some more and I'm now convinced that indeed that code is gone. We should fix the comments.