Corrected handling of :if-does-not-exist <value> for SETF functions.

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2021-05-12 16:42:55
Author local date 2021-05-12 18:42:55 +0200
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2021-05-12 16:42:55
Committer local date 2021-05-12 18:42:55 +0200
Commit 5f98f62a58afcb0ffbc04bd9aac71a8d9eb38d7a
Tree e981b6a30b11047ea42f20b93e8a10caad5c84b0
Parent 3ff9a91e3d73e1795fbaf5560796b5386ed30b4e
Corrected handling of :if-does-not-exist <value> for SETF functions.

IF-DOES-NOT-EXIST can be :error, :create, nil, or another value, equivalent to :CREATE.
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