tornado/docs/releases/v5.0.2.rst

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What's new in Tornado 5.0.2
===========================
Apr 7, 2018
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Bug fixes
~~~~~~~~~
- Fixed a memory leak when `.IOLoop` objects are created and destroyed.
- If `.AsyncTestCase.get_new_ioloop` returns a reference to a
preexisting event loop (typically when it has been overridden to
return `.IOLoop.current()`), the test's ``tearDown`` method will not
close this loop.
- Fixed a confusing error message when the synchronous `.HTTPClient`
fails to initialize because an event loop is already running.
- `.PeriodicCallback` no longer executes twice in a row due to
backwards clock adjustments.