Module 'django.db.models.deletion' has no attribute 'get_candidate_relations_to_delete'

[PeterJCLaw]

Thanks for these type stubs. I'm just trying them out on a large Django codebase and I've hit a warning which seems incorrect:

from django.db.models.deletion import get_candidate_relations_to_delete

will emit an error about the memcached backend not being present:

Module 'django.db.models.deletion' has no attribute 'get_candidate_relations_to_delete'

(sorry these ended up as three separate issues, in hindisght it might have made more sense to report them in the same go)