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Patch attached. It basically says:
8<--------------------------------------------------------------------
Note: Because using :keyword:`from` can throw away valuable debugging information, its use with a bare :keyword:`raise` is not supported. If you are trying to do this:
 try:
 some_module.not_here()
 except NameError:
 try:
 backup_module.not_here()
 except NameError:
 raise from None # suppress context in NameError
do this instead:
 try:
 some_module.not_here()
 except NameError:
 try:
 backup_module.not_here()
 except NameError as exc:
 raise exc from None # suppress context in NameError
8<--------------------------------------------------------------------