Fight bitrot in tornado.platform.twisted.

A new release of zope.interface breaks things on python 2.5, and
sets off our (overly-sensitive?) deprecation checking.

tornado/platform/twisted.py

@@ -41,7 +41,7 @@
 
 before closing the `IOLoop`.
 
-This module has been tested with Twisted versions 11.0.0 and 11.1.0.
+This module has been tested with Twisted versions 11.0.0, 11.1.0, and 12.0.0
 """
 
 from __future__ import absolute_import, division, with_statement
@@ -66,6 +66,11 @@
 
 class TornadoDelayedCall(object):
     """DelayedCall object for Tornado."""
+    # Note that zope.interface.implements is deprecated in
+    # zope.interface 4.0, because it cannot work in python 3.  The
+    # replacement is a class decorator, which cannot work on python
+    # 2.5.  So when twisted supports python 3, we'll need to drop 2.5
+    # support on this module to make it work.
     implements(IDelayedCall)
 
     def __init__(self, reactor, seconds, f, *args, **kw):

tornado/test/runtests.py

@@ -42,11 +42,18 @@ def all():
     # ignored by default, including DeprecationWarnings and
     # python 3.2's ResourceWarnings.
     warnings.filterwarnings("error")
-    # Tornado shouldn't use anything deprecated, but some of our
-    # dependencies do (last match wins).
+    # Tornado generally shouldn't use anything deprecated, but some of
+    # our dependencies do (last match wins).
     warnings.filterwarnings("ignore", category=DeprecationWarning)
     warnings.filterwarnings("error", category=DeprecationWarning,
                             module=r"tornado\..*")
+    # tornado.platform.twisted uses a deprecated function from
+    # zope.interface in order to maintain compatibility with
+    # python 2.5
+    warnings.filterwarnings("ignore", category=DeprecationWarning,
+                            module=r"tornado\.platform\.twisted")
+    warnings.filterwarnings("ignore", category=DeprecationWarning,
+                            module=r"tornado\.test\.twisted_test")
 
     import tornado.testing
     tornado.testing.main()

tox.ini

@@ -37,6 +37,8 @@ deps =
      pycurl
      simplejson
      twisted>=12.0.0
+     # zope.interface (used by twisted) dropped python 2.5 support in 4.0
+     zope.interface<4.0
 
 # py26-full deliberately runs an older version of twisted to ensure
 # we're still compatible with the oldest version we support.