Commit 9b995d55 authored by Stefan Monnier's avatar Stefan Monnier
Browse files

(cl-generic-define-method): Side effects are evil (bug#20644)

* lisp/emacs-lisp/cl-generic.el (cl-generic-define-method): Don't reuse
cons-cells that might be used as keys in an `equal' hash-table.
parent 969f3fb2
......@@ -432,8 +432,10 @@ which case this method will be invoked when the argument is `eql' to VAL.
(> (cl--generic-generalizer-priority x)
(cl--generic-generalizer-priority y)))))))
(setq i (1+ i))))
(if me (setcar me method)
(setf (cl--generic-method-table generic) (cons method mt)))
;; We used to (setcar me method), but that can cause false positives in
;; the hash-consing table of the method-builder (bug#20644).
;; See the related FIXME in cl--generic-build-combined-method.
(setf (cl--generic-method-table generic) (cons method (delq (car me) mt)))
(cl-pushnew `(cl-defmethod . (,(cl--generic-name generic) . ,specializers))
current-load-list :test #'equal)
;; FIXME: Try to avoid re-constructing a new function if the old one
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