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ccorrodi committed 9fb08c6

fix non exhaustive pattern-matching

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Files changed (1)

             [process_rule cur next]
         | next :: cur :: rest ->
             (process_rule cur next) :: (helper (cur :: rest))
+        | cur :: [] ->
+            [cur]
+        | [] ->
+            (* this case should never happen *)
+            []
       in
       new_rules
     in
-    L.hd rules :: (helper rules)
+    if L.length rules > 0 then
+      L.hd rules :: (helper rules)
+    else
+      []
   in
 
   let process_db (db : A.database) : A.database =
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