bug#23739: Unexpected behavior of 'add-to-load-path'.

[Mathieu Lirzin]

Hello,

I have noticed something that doesn't feel right when using
‘add-to-load-path’.

$ cat test.scm
--8<---------------cut here---------------start------------->8---
(define old %load-path)
(add-to-load-path "foo")
(pk %load-path)
(pk old)
--8<---------------cut here---------------end--------------->8---

first run:

$ guile test.scm
--8<---------------cut here---------------start------------->8---
;;; [Compilation]
;;; (("foo" "foo" "/usr/share/guile/2.0" "/usr/share/guile/site/2.0" 
"/usr/share/guile/site" "/usr/share/guile"))

;;; (("foo" "/usr/share/guile/2.0" "/usr/share/guile/site/2.0" 
"/usr/share/guile/site" "/usr/share/guile"))
--8<---------------cut here---------------end--------------->8---

next runs:

$ guile test.scm
--8<---------------cut here---------------start------------->8---
;;; (("foo" "/usr/share/guile/2.0" "/usr/share/guile/site/2.0" 
"/usr/share/guile/site" "/usr/share/guile"))

;;; (("/usr/share/guile/2.0" "/usr/share/guile/site/2.0" 
"/usr/share/guile/site" "/usr/share/guile"))
--8<---------------cut here---------------end--------------->8---

each time test.scm is recompiled the first result reappears.  This has
been tested with Guile 2.0.11 and Guile master.

Thanks,

-- 
Mathieu Lirzin