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-rw-r--r--lisp/emacs-lisp/pcase.el5
1 files changed, 4 insertions, 1 deletions
diff --git a/lisp/emacs-lisp/pcase.el b/lisp/emacs-lisp/pcase.el
index fd6b0c8db5c..fe62820f0cb 100644
--- a/lisp/emacs-lisp/pcase.el
+++ b/lisp/emacs-lisp/pcase.el
@@ -1172,7 +1172,10 @@ The predicate is the logical-AND of:
(upatd (pcase--expand-\` (cdr qpat))))
(if (and (eq (car-safe upata) 'quote) (eq (car-safe upatd) 'quote))
`'(,(cadr upata) . ,(cadr upatd))
- `(and (pred consp)
+ `(and ,@(when (eq (car qpat) '\`)
+ `((guard ,(macroexp-warn-and-return
+ "Nested ` are not supported" t nil nil qpat))))
+ (pred consp)
(app car-safe ,upata)
(app cdr-safe ,upatd)))))
((or (stringp qpat) (numberp qpat) (symbolp qpat)) `',qpat)