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Avoid infloops in help-fns--analyze-function with aliases

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* lisp/help-fns.el (help-fns--analyze-function): Use
function-alias-p to avoid infloops.
This commit is contained in:
Lars Ingebrigtsen 2022-01-13 09:42:36 +01:00
parent c8a2af3037
commit d30fde6b0c
2 changed files with 10 additions and 5 deletions
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6
lisp/help-fns.el
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@ -829,11 +829,7 @@ Returns a list of the form (REAL-FUNCTION DEF ALIASED REAL-DEF)."
(symbol-name function)))))))
(real-def (cond
((and aliased (not (subrp def)))
(let ((f real-function))
(while (and (fboundp f)
(symbolp (symbol-function f)))
(setq f (symbol-function f)))
f))
(car (function-alias-p real-function t)))
((subrp def) (intern (subr-name def)))
(t def))))

9
test/lisp/help-fns-tests.el
View File

@ -177,4 +177,13 @@ Return first line of the output of (describe-function-1 FUNC)."
(should-not (find-lisp-object-file-name help-fns--test-var 'defface))
(should-not (find-lisp-object-file-name help-fns--test-var 1))))
(ert-deftest help-fns--analyze-function-recursive ()
(defalias 'help-fns--a 'help-fns--b)
(should (equal (help-fns--analyze-function 'help-fns--a)
'(help-fns--a help-fns--b t help-fns--b)))
;; Make a loop and see that it doesn't infloop.
(defalias 'help-fns--b 'help-fns--a)
(should (equal (help-fns--analyze-function 'help-fns--a)
'(help-fns--a help-fns--b t help-fns--b))))
;;; help-fns-tests.el ends here