[tahoe-lafs-trac-stream] [tahoe-lafs] #1643: presence of MDMF in aliases break the CLI < v1.9.0

[tahoe-lafs]

#1643: presence of MDMF in aliases break the CLI < v1.9.0
-------------------------+-------------------------------------------------
     Reporter:  zooko    |      Owner:  daira
         Type:  defect   |     Status:  closed
     Priority:  major    |  Milestone:  1.10.0
    Component:  code-    |    Version:  1.9.0
  mutable                |   Keywords:  versioning forward-compatibility
   Resolution:  fixed    |  backward-compatibility mutable mdmf aliases
Launchpad Bug:           |  error review-needed
-------------------------+-------------------------------------------------

Comment (by warner):

 Ah, I was wondering whether that'd be ok or not. If someone runs the tests
 with `-O`, then assertions would be turned off, and that check would fail.
 So I've tended towards either creating a new exception type for things
 that we care deeply about, or deciding that we don't care deeply and not
 exercising `AssertionErrors`. If you're cool with having the tests depend
 on not-`-O`, then I am too.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1643#comment:17>
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