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Fix gensym

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* lisp/subr.el (gensym): Actually implement the default prefix.
* test/lisp/subr-tests.el (subr-tests--gensym): New test.
This commit is contained in:
Mark Oteiza 2017-09-18 09:00:45 -04:00
parent 466df76f7d
commit 331d0e520f
2 changed files with 7 additions and 1 deletions
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2
lisp/subr.el
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@ -289,7 +289,7 @@ The name is made by appending `gensym-counter' to PREFIX.
PREFIX is a string, and defaults to \"g\"."
(let ((num (prog1 gensym-counter
(setq gensym-counter (1+ gensym-counter)))))
(make-symbol (format "%s%d" prefix num))))
(make-symbol (format "%s%d" (or prefix "g") num))))
(defun ignore (&rest _ignore)
"Do nothing and return nil.

6
test/lisp/subr-tests.el
View file

@ -300,6 +300,12 @@ cf. Bug#25477."
(setq res (read-passwd "pass: " 'confirm (mapconcat #'string default "")))
(should (string= default res)))))
(ert-deftest subr-tests--gensym ()
"Test `gensym' behavior."
(should (equal (symbol-name (let ((gensym-counter 0)) (gensym)))
"g0"))
(should (eq (string-to-char (symbol-name (gensym))) ?g))
(should (eq (string-to-char (symbol-name (gensym "X"))) ?X)))
(provide 'subr-tests)
;;; subr-tests.el ends here