02/08: modules: Report the search path in &missing-dependency-error.

[Ludovic Courtès]

civodul pushed a commit to branch wip-pull-multiple-derivations
in repository guix.

commit 322525a253a6cd4d5ce6e5fdd04cb20aca56f531
Author: Ludovic Courtès <address@hidden>
Date:   Tue Apr 3 23:33:39 2018 +0200

    modules: Report the search path in &missing-dependency-error.
    
    * guix/modules.scm (&missing-dependency-error)[search-path]: New field.
    (source-module-dependencies): Initialize the 'search-path' field.
---
 guix/modules.scm | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/guix/modules.scm b/guix/modules.scm
index bf656bb..65928f6 100644
--- a/guix/modules.scm
+++ b/guix/modules.scm
@@ -25,6 +25,7 @@
   #:use-module (ice-9 match)
   #:export (missing-dependency-error?
             missing-dependency-module
+            missing-dependency-search-path
 
             file-name->module-name
             module-name->file-name
@@ -47,7 +48,8 @@
 ;; The error corresponding to a missing module.
 (define-condition-type &missing-dependency-error &error
   missing-dependency-error?
-  (module  missing-dependency-module))
+  (module      missing-dependency-module)
+  (search-path missing-dependency-search-path))
 
 (define (colon-symbol? obj)
   "Return true if OBJ is a symbol that starts with a colon."
@@ -132,7 +134,8 @@ depends on."
          (module-file-dependencies file))
         (#f
          (raise (condition (&missing-dependency-error
-                            (module module))))))))
+                            (module module)
+                            (search-path load-path))))))))
 
 (define* (module-closure modules
                          #:key