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� | d���S ) a� Return a future aggregating results from the given coroutines/futures.
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done successfully, the returned future's result is the list of
results (in the order of the original sequence, not necessarily
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exceptions in the tasks are treated the same as successful
results, and gathered in the result list; otherwise, the first
raised exception will be immediately propagated to the returned
future.
Cancellation: if the outer Future is cancelled, all children (that
have not completed yet) are also cancelled. If any child is
cancelled, this is treated as if it raised CancelledError --
the outer Future is *not* cancelled in this case. (This is to
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be cancelled.)
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a. Wait for a future, shielding it from cancellation.
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res = await shield(something())
except CancelledError:
res = None
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