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-rw-r--r--module/util.scm1
1 files changed, 1 insertions, 0 deletions
diff --git a/module/util.scm b/module/util.scm
index fce1c014..1cc357fa 100644
--- a/module/util.scm
+++ b/module/util.scm
@@ -375,6 +375,7 @@
(for value in lst
(let ((key (proc value)))
(hash-set! h key (cons value (hash-ref h key '())))))
+ ;; NOTE changing this list to cons allows the output to work with assq-merge.
(hash-map->list list h)))
;; (group-by '(0 1 2 3 4 2 5 6) 2)