records: `alist->record' supports multiple-field occurrences.

* guix/records.scm (alist->record): Add `multiple-value-keys'
  parameter.  Update docstring, and honor it.
* tests/records.scm ("alist->record"): New record.

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/records.scm b/tests/records.scm
index d0635ebb1f1..712eb83a096 100644
--- a/tests/records.scm
+++ b/tests/records.scm
@@ -158,6 +158,12 @@ Version: 1.5
     (list (recutils->alist p)
           (recutils->alist p))))
 
+(test-equal "alist->record" '((1 2) b c)
+  (alist->record '(("a" . 1) ("b" . b) ("c" . c) ("a" . 2))
+                 list
+                 '("a" "b" "c")
+                 '("a")))
+
 (test-end)