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I'm really confused with what's happening here.

In my config for backups I've the line (setq backup-directory-alist '(("" . "~/.emacs.d/backup/per-save"))) and I've a defined a variable in my init.el like so: 

(defvar user-home-directory (concat (getenv "HOME") "/")) 
(setq user-emacs-directory (concat user-home-directory ".emacs.d/"))

I tried to redefine backup-directory-alist like so:

(setq backup-directory-alist '(("" . ((concat user-emacs-directory "backup/per-save/")))))

But I'm getting the wrong type argument stringp everytime I try to save the file. What's going on! What am I doing wrong with alist value data.

NickD
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Chakravarthy Raghunandan
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    You are trying to execute code inside a quoted expression, but the quoted expression is not interpreted as code. You could fix it by changing `'` to `\`` and using `,` in front of `(concat ...)`. – wvxvw Dec 19 '16 at 13:22
  • Ah that was an easy fix. My problem was, I did not know what to google search for. – Chakravarthy Raghunandan Dec 19 '16 at 16:02

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