* lisp/emacs-lisp/cl-macs.el (cl-struct-slot-offset): Mark as pure.

* lisp/emacs-lisp/cl-macs.el (cl-struct-slot-offset): Mark as pure.
(cl--set-elt): Don't proclaim as inline.
(cl-struct-slot-value): Remove explicit gv-setter and compiler-macro.
Define as inlinable instead.
(cl-struct-set-slot-value): Remove.
* doc/misc/cl.texi (Structures): Remove cl-struct-set-slot-value.
* lisp/emacs-lisp/cl-lib.el (cl--set-elt): Remove.
* lisp/emacs-lisp/cl-seq.el (cl-replace, cl-substitute, cl-nsubstitute):
Use setf instead.