(add-hook 'xref-backend-functions #'elisp--xref-backend nil t)
(setq-local project-vc-external-roots-function #'elisp-load-path-roots)
(add-hook 'completion-at-point-functions
(add-hook 'xref-backend-functions #'elisp--xref-backend nil t)
(setq-local project-vc-external-roots-function #'elisp-load-path-roots)
(add-hook 'completion-at-point-functions