bug#38388: [2.9.5] Inaccurate source location info for unbound variables

[Ludovic Courtès]

Hello,

I have a test that runs ‘guix system build’ on this file:

--8<---------------cut here---------------start------------->8---
(use-modules (gnu))                                   ; 1
(use-service-modules networking)                      ; 2

(operating-system                                     ; 4
  (host-name "antelope")                              ; 5
  (timezone "Europe/Paris")                           ; 6
  (locale "en_US.UTF-8")                              ; 7

  (bootloader (GRUB-config (target "/dev/sdX")))      ; 9
  (file-systems (cons (file-system
                        (device (file-system-label "root"))
                        (mount-point "/")
                        (type "ext4"))
                      %base-file-systems)))
--8<---------------cut here---------------end--------------->8---

Here, ‘GRUB-config’ is unbound, and the test expects to see a stack
frame corresponding to line 9.

However, the stack frame we get is for line 11, char 32, which
corresponds to (file-system-label "root").

So it would seem that the IP-to-source-location mapping is not quite
working as expected.

Thoughts?

Ludo’.