[issue3781] warnings.catch_warnings fails gracelessly when recording warnings but no warnings are emitted

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Reversion patch attached - it does indeed recreate some nasty
dependencies from the main areas of the standard library on to the
regression test suite. That's enough to kill the idea of a complete
reversion as far as I'm concerned - I'll get the proper fix done this
evening.

(That's 18-20 hours from the time of this post, for anyone trying to
figure out timezones)

Added file: http://bugs.python.org/file11444/issue3781_revert_to_beta_implementation_26.diff

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