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* lisp/emacs-lisp/bytecomp.el (add-to-list): Add handler to check the

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variable's status.
This commit is contained in:
Stefan Monnier 2011-06-20 21:43:56 -04:00
parent ca5307394f
commit 478d6f95ff
2 changed files with 24 additions and 0 deletions
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19
lisp/emacs-lisp/bytecomp.el
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@ -4244,6 +4244,25 @@ binding slots have been popped."
(defun byte-compile-form-make-variable-buffer-local (form)
(byte-compile-keep-pending form 'byte-compile-normal-call))
(byte-defop-compiler-1 add-to-list byte-compile-add-to-list)
(defun byte-compile-add-to-list (form)
;; FIXME: This could be used for `set' as well, except that it's got
;; its own opcode, so the final `byte-compile-normal-call' needs to
;; be replaced with something else.
(pcase form
(`(,fun ',var . ,_)
(byte-compile-check-variable var 'assign)
(if (assq var byte-compile--lexical-environment)
(byte-compile-log-warning
(format "%s cannot use lexical var `%s'" fun var)
nil :error)
(unless (or (not (byte-compile-warning-enabled-p 'free-vars))
(boundp var)
(memq var byte-compile-bound-variables)
(memq var byte-compile-free-references))
(byte-compile-warn "assignment to free variable `%S'" var)
(push var byte-compile-free-references)))))
(byte-compile-normal-call form))
;;; tags