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| author | Stefan Kangas <stefankangas@gmail.com> | 2023-09-26 18:13:00 +0200 |
|---|---|---|
| committer | Stefan Kangas <stefankangas@gmail.com> | 2023-09-29 00:28:28 +0200 |
| commit | 71feee79309b66a7baf7847472ccebf019d2a801 (patch) | |
| tree | 6edae37cd0d39fea129ebc7d1e4a8f2552e246cc /lisp/emacs-lisp | |
| parent | 72cc9cf2cde6e8bce7884f6a91db90e592ca931c (diff) | |
| download | emacs-71feee79309b66a7baf7847472ccebf019d2a801.tar.gz emacs-71feee79309b66a7baf7847472ccebf019d2a801.tar.bz2 emacs-71feee79309b66a7baf7847472ccebf019d2a801.zip | |
Doc fix in let-alist for keys with nil value
* lisp/emacs-lisp/let-alist.el (let-alist): Clarify that keys with a
nil value will give the same result as if they were missing.
Diffstat (limited to 'lisp/emacs-lisp')
| -rw-r--r-- | lisp/emacs-lisp/let-alist.el | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/lisp/emacs-lisp/let-alist.el b/lisp/emacs-lisp/let-alist.el index d9ad46b2af7..1f08cc41a5c 100644 --- a/lisp/emacs-lisp/let-alist.el +++ b/lisp/emacs-lisp/let-alist.el @@ -60,7 +60,7 @@ ;; the variables of the outer one. You can, however, access alists ;; inside the original alist by using dots inside the symbol, as ;; displayed in the example above by the `.site.contents'. -;; + ;;; Code: @@ -139,7 +139,14 @@ essentially expands to If you nest `let-alist' invocations, the inner one can't access the variables of the outer one. You can, however, access alists inside the original alist by using dots inside the symbol, as -displayed in the example above." +displayed in the example above. + +Note that there is no way to differentiate the case where a key +is missing from when it is present, but its value is nil. Thus, +the following form evaluates to nil: + + (let-alist '((some-key . nil)) + .some-key)" (declare (indent 1) (debug t)) (let ((var (make-symbol "alist"))) `(let ((,var ,alist)) |