sys.set_coroutine_wrapper is removed in Python 3.8#253
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Jun 11, 2019
The functions `sys.set_coroutine_wrapper` and `sys.get_coroutine_wrapper`, which were provisionally added to Python 3.5 and deprecated in Python 3.7, are removed in Python 3.8. uvloop doesn't use them since Python 3.7, but they remained defined in stdlib.pxi, leading to AttributeErrors on Python 3.8+. This makes the definition fallback to None if such functions don't exist. Fixes MagicStack#251
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The functions
sys.set_coroutine_wrapperandsys.get_coroutine_wrapper,which were provisionally added to Python 3.5 and deprecated in Python 3.7,
are removed in Python 3.8.
uvloop doesn't use them since Python 3.7, but they remained defined
in stdlib.pxi, leading to AttributeErrors on Python 3.8+.
This makes the definition fallback to None if such functions don't exist.
Fixes #251