Follow-up Comment #3, bug #21823 (project make):
This is confusing, and the lack of detailed comments in hash.c doesn't help.
However, I think this particular bug is impossible. Looking at the
implementation of hash_find_slot(), it seems there is no way for that function
to return null. So, the test in hash_insert() to see if slot is null is
unneeded and we can never pass null to hash_insert_at() from hash_insert().
That useless check in hash_insert() should be removed to avoid a bit of
confusion and a useless operation or two.
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