(declare (generation-index generation))
#!-gencgc
(declare (ignore value generation))
#!-gencgc
(error "(SETF ~S) is a GENCGC only function and unavailable in this build"
(declare (generation-index generation))
#!-gencgc
(declare (ignore value generation))
#!-gencgc
(error "(SETF ~S) is a GENCGC only function and unavailable in this build"