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(B6) this program fails the check for no sys.exc_info(), even though at
 the point this assert runs (called from the <== line) we are not in
 any except/finally block. This is a generalization of
 test_exceptions:test_generator_doesnt_retain_old_exc::
 import sys
 def g():
 try:
 raise ValueError
 except ValueError:
 yield 1
 assert sys.exc_info() == (None, None, None)
 yield 2
 gen = g()
 try:
 raise IndexError
 except IndexError:
 assert next(gen) is 1
 assert next(gen) is 2 # <==