[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2636: switch to @implementer syntax for Zope interfaces

[Tahoe-LAFS]

#2636: switch to @implementer syntax for Zope interfaces
-------------------------+-------------------------------------------------
     Reporter:  daira    |      Owner:
         Type:  defect   |     Status:  new
     Priority:  normal   |  Milestone:  1.11.0
    Component:  code     |    Version:  1.10.2
   Resolution:           |   Keywords:  zope.interface forward-
Launchpad Bug:           |  compatibility cleanup
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Description changed by daira:

Old description:

> [The changelog https://pypi.python.org/pypi/zope.interface/4.0.1] says
> that the `implements(...)` syntax was deprecated in zope.interface
> version 4.0.0.

New description:

 [https://pypi.python.org/pypi/zope.interface/4.0.1 The changelog] says
 that the `@implementer` syntax was added in zope.interface version 3.6.0
 (which Tahoe-LAFS already depends on), and that the `implements(...)`
 syntax was deprecated in version 4.0.0.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2636#comment:1>
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