geiser-xref-callers does not seem to work

[Chris Marusich]

Hi,

It seems that geiser-xref-callers does not work for me.  I believe I've
configured Geiser correctly, since other commands like
geiser-edit-symbol-at-point and geiser-doc-symbol-at-point do work in
some cases.

Here is a specific example where it fails for me:

* Clone the Guix Git repository (for commit
  9e111db4535b3cd5729e37294ae51d95240334b4 if you want to be precise):

    git clone https://git.savannah.gnu.org/git/guix.git

* Configure Geiser for Guix as described in Guix's manual ((guix) The
  Perfect Setup).

* Open gnu/system/vm.scm in the Guix source tree, and run
  switch-to-geiser-module for the (gnu system vm) module.

* Place point on symbol expression->derivation-in-linux-vm on line 203
  (in the definition of the iso9660-image procedure), and press "C-c <".

When I do this, I receive the following message in the minibuffer:

  No callers found for ’expression->derivation-in-linux-vm’

And yet, if I run "M-x rgrep" on the same symbol, there are obviously
many call sites:

  ./gnu/system/vm.scm:68:  #:export (expression->derivation-in-linux-vm
  ./gnu/system/vm.scm:105:(define* (expression->derivation-in-linux-vm name exp
  ./gnu/system/vm.scm:203:  (expression->derivation-in-linux-vm
  ./gnu/system/vm.scm:274:  (expression->derivation-in-linux-vm

What might the problem be?  When I run "M-x geiser-doc-symbol-at-point"
on this symbol, it also claims that there is no documentation
available.  I feel like maybe I've misconfigured something, but I don't
know what.

Here are the Geiser-specific things I've added to my ~/.emacs file:

--8<---------------cut here---------------start------------->8---
;; Tell geiser where guix checkout lives
(with-eval-after-load 'geiser-guile
                      (add-to-list 'geiser-guile-load-path "~/guix"))

(add-hook 'geiser-repl-mode-hook 'enable-paredit-mode)

;; Keybind customizations
(add-hook 'geiser-mode-hook
          (lambda ()
            (local-set-key (kbd "C-c m") 'switch-to-geiser-module)))
(add-hook 'geiser-mode-hook
          (lambda ()
            (local-set-key (kbd "C-c i") 'geiser-repl-import-module)))
--8<---------------cut here---------------end--------------->8---

-- 
Chris

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