demandimport: blacklist sqlalchemy.events as it has side effects (issue5085)
Importing sqlalchemy.events cannot be delayed as it registers classes to
their event mechanism. It worked fine before 4f1144c3c72b, since they use
new-style imports. But now we have to blacklist it because our demandimport
can handle new-style imports.
This patch series isn't intended for stable as we don't guarantee API
compatibility with 3rd-party extensions. They can temporarily disable the
demand importer to work around the issue.
--- a/mercurial/demandimport.py Sat Feb 06 19:09:10 2016 +0900
+++ b/mercurial/demandimport.py Sat Feb 06 19:16:12 2016 +0900
@@ -255,6 +255,7 @@
'_sre', # issue4920
'rfc822',
'mimetools',
+ 'sqlalchemy.events', # has import-time side effects (issue5085)
# setuptools 8 expects this module to explode early when not on windows
'distutils.msvc9compiler'
]