package-vc-install bug?

[James Thomas]

M-x package-vc-install RET <package> RET fails with the following on my
system:

--8<---------------cut here---------------start------------->8---
Debugger entered--Lisp error: (error "Can’t read whole string")
  signal(error ("Can’t read whole string"))
  error("Can't read whole string")
  package-read-from-string("((emacs \"28.1\") (python \"0.2\") (csv-mode 
\"1.12\"))")
  package-vc--unpack-1(#s(package-desc :name python-view-data :version 
(20230508 543) :summary "View data in python" :reqs ((emacs (28 1)) (python (0 
2)) (csv-mode (1 12))) :kind vc :archive "melpa" :dir 
"/home/user/.emacs.d/elpa/python-view-data/" :extras ((:commit . 
"1dd5f99679db9767530cfc20642a40a48bd479be") (:authors ("Shuguang Sun" . 
"shuguang79@qq.com")) (:maintainers ("Shuguang Sun" . "shuguang79@qq.com")) 
(:maintainer "Shuguang Sun" . "shuguang79@qq.com") (:keywords "tools") (:url . 
"https://github.com/ShuguangSun/python-view-data";)) :signed nil) 
"/home/user/.emacs.d/elpa/python-view-data/")
  package-vc--unpack(#s(package-desc :name python-view-data :version (20230508 
543) :summary "View data in python" :reqs ((emacs (28 1)) (python (0 2)) 
(csv-mode (1 12))) :kind tar :archive "melpa" :dir nil :extras ((:commit . 
"1dd5f99679db9767530cfc20642a40a48bd479be") (:authors ("Shuguang Sun" . 
"shuguang79@qq.com")) (:maintainers ("Shuguang Sun" . "shuguang79@qq.com")) 
(:maintainer "Shuguang Sun" . "shuguang79@qq.com") (:keywords "tools") (:url . 
"https://github.com/ShuguangSun/python-view-data";)) :signed nil) (:url 
"https://github.com/ShuguangSun/python-view-data.git";) nil)
  package-vc-install("python-view-data" nil nil python-view-data)
  funcall-interactively(package-vc-install "python-view-data" nil nil 
python-view-data)
  call-interactively(package-vc-install record nil)
  command-execute(package-vc-install record)
  execute-extended-command(nil "package-vc-install" "pac")
  funcall-interactively(execute-extended-command nil "package-vc-install" "pac")
  call-interactively(execute-extended-command nil nil)
  command-execute(execute-extended-command)
--8<---------------cut here---------------end--------------->8---

and I can fix it with this:

diff --git a/lisp/emacs-lisp/package-vc.el b/lisp/emacs-lisp/package-vc.el
index db0cc515e46..979bbb343ed 100644
--- a/lisp/emacs-lisp/package-vc.el
+++ b/lisp/emacs-lisp/package-vc.el
@@ -526,6 +526,7 @@ package-vc--unpack-1
             (when-let* ((require-lines (lm-header-multiline 
"package-requires")))
               (thread-last
                 (mapconcat #'identity require-lines " ")
+                ((lambda (line) (concat line "\n")))
                 package-read-from-string
                 lm--prepare-package-dependencies
                 (nconc deps)

But I'm shying away from reporting a bug because I can't find any recent
code changes that could cause this.

Could someone help/confirm? I'm using Emacs 29.

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