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Clarify that 'pcase-lambda' only destructs

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* lisp/emacs-lisp/pcase.el (pcase-lambda): Copy notice from
'pcase-let', indicating that pcase-lambda won't pattern match
like 'pcase', but just try to destruct with uncertain side
effects if this fails. (Bug#71503)
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Philip Kaludercic 2024-08-04 16:52:38 +02:00
parent 1b806a200e
commit 0756f3085e
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1 changed files with 8 additions and 3 deletions
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lisp/emacs-lisp/pcase.el
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@ -241,9 +241,14 @@ not signal an error."
;;;###autoload
(defmacro pcase-lambda (lambda-list &rest body)
"Like `lambda' but allow each argument to be a pattern.
I.e. accepts the usual &optional and &rest keywords, but every
formal argument can be any pattern accepted by `pcase' (a mere
variable name being but a special case of it)."
I.e. accepts the usual &optional and &rest keywords, but every formal
argument can be any pattern destructed by `pcase-let' (a mere variable
name being but a special case of it).
Each argument should match its respective pattern in the parameter
list (i.e. be of a compatible structure); a mismatch may signal an error
or may go undetected, binding arguments to arbitrary values, such as
nil."
(declare (doc-string 2) (indent defun)
(debug (&define (&rest pcase-PAT) lambda-doc def-body)))
(let* ((bindings ())