(let ((,instance (truly-the ,(dd-name dd)
(%make-instance-with-layout
(%delayed-get-compiler-layout ,(dd-name dd))))))
- (declare (optimize (safety 0))) ; Suppress redundant slot type checks.
,@(when raw-index
`((setf (%instance-ref ,instance ,raw-index)
(make-array ,(dd-raw-length dd)