Fix propagation of StopIteration exception
Python 3.7 improved the handling of exceptions in loops, so this piece of code
def generator(): # this raises a StopIteration yield next(_ for _ in ) for x in generator(): pass
was working with Python <= 3.6 because the
StopIteration exception was bubbling up from inside
generator and stopping the loop
for x in generator() (and I did it like that on purpose!).
As of Python 3.7 the exceptions are handled properly, and that code does not work anymore because it properly reports that
generator raised an exception.
Closes #129 (closed)