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; (let-alist): Document double-dot escape syntax. (Bug#75852)

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Eshel Yaron 2025-01-26 08:56:15 +01:00
parent 5617b07a45
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6
lisp/emacs-lisp/let-alist.el
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@ -141,6 +141,12 @@ 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.
To refer to a non-`let-alist' variable starting with a dot in BODY, use
two dots instead of one. For example, in the following form `..foo'
refers to the variable `.foo' bound outside of the `let-alist':
(let ((.foo 42)) (let-alist \\='((foo . nil)) ..foo))
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: