Be more careful about applying spliced arguments

Previously, this could 'nonc' to a list that shouldn't be modified.

* lisp/eshell/esh-cmd.el (eshell-rewrite-named-command): Use 'append'
instead of 'nconc'.

* test/lisp/eshell/esh-var-tests.el (esh-var-test/interp-var-splice):
(esh-var-test/quoted-interp-var-splice): New tests.

1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/eshell/esh-cmd.el b/lisp/eshell/esh-cmd.el
index c9096b0d159..137abe6eb75 100644
--- a/lisp/eshell/esh-cmd.el
+++ b/lisp/eshell/esh-cmd.el
@@ -488,7 +488,7 @@ command hooks should be run before and after the command."
           (grouped-terms (eshell-prepare-splice terms)))
       (cond
        (grouped-terms
-        `(let ((new-terms (nconc ,@grouped-terms)))
+        `(let ((new-terms (append ,@grouped-terms)))
            (,sym (car new-terms) (cdr new-terms))))
        ;; If no terms are spliced, use a simpler command form.
        ((cdr terms)