asyncio.TaskGroup keeps references to errors after raising ExceptionGroup

asyncio.TaskGroup keeps references to errors after raising ExceptionGroup. This is because it keeps a ref to list of errors in errors local and since this local is kept alive by frame via traceback, this causes ref cycles. The correct fix is to use self._errors directly and then assign None to it in finally.

cpython/Lib/asyncio/taskgroups.py

Lines 127 to 135 in 8d57423

    
           if self._errors: 
        
               # Exceptions are heavy objects that can have object 
        
               # cycles (bad for GC); let's not keep a reference to 
        
               # a bunch of them. 
        
               errors = self._errors 
        
               self._errors = None 
        
               me = BaseExceptionGroup('unhandled errors in a TaskGroup', errors) 
        
               raise me from None

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	if self._errors:
	# Exceptions are heavy objects that can have object
	# cycles (bad for GC); let's not keep a reference to
	# a bunch of them.
	errors = self._errors
	self._errors = None

	me = BaseExceptionGroup('unhandled errors in a TaskGroup', errors)
	raise me from None

Uh oh!

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