Add support for &rest in `seq-let'

* lisp/emacs-lisp/seq.el (seq--make-bindings): Add support for `&rest'
in the argument list.
* test/automated/seq-tests.el: Add a test for parsing and binding
`&rest' in `seq-let'.

1 files changed, 5 insertions, 1 deletions

diff --git a/test/automated/seq-tests.el b/test/automated/seq-tests.el
index e1e8ae002d0..ab46eb85f76 100644
--- a/test/automated/seq-tests.el
+++ b/test/automated/seq-tests.el
@@ -283,7 +283,11 @@ Evaluate BODY for each created sequence.
       (should (= b 2))
       (should (= c 3))
       (should (= d 4))
-      (should (null e))))
+      (should (null e)))
+    (seq-let (a b &rest others) seq
+      (should (= a 1))
+      (should (= b 2))
+      (should (same-contents-p others (seq-drop seq 2)))))
   (let ((seq '(1 (2 (3 (4))))))
     (seq-let (_ (_ (_ (a)))) seq
       (should (= a 4))))