datalog: indirect aggregate cycle rejected (230/230)

lib/datalog/scoreboard.json

@@ -1,8 +1,8 @@
 {
   "lang": "datalog",
-  "total_passed": 229,
+  "total_passed": 230,
   "total_failed": 0,
-  "total": 229,
+  "total": 230,
   "suites": [
     {"name":"tokenize","passed":26,"failed":0,"total":26},
     {"name":"parse","passed":18,"failed":0,"total":18},
@@ -11,10 +11,10 @@
     {"name":"builtins","passed":20,"failed":0,"total":20},
     {"name":"semi_naive","passed":8,"failed":0,"total":8},
     {"name":"negation","passed":10,"failed":0,"total":10},
-    {"name":"aggregates","passed":19,"failed":0,"total":19},
+    {"name":"aggregates","passed":20,"failed":0,"total":20},
     {"name":"api","passed":20,"failed":0,"total":20},
     {"name":"magic","passed":28,"failed":0,"total":28},
     {"name":"demo","passed":21,"failed":0,"total":21}
   ],
-  "generated": "2026-05-08T12:38:51+00:00"
+  "generated": "2026-05-08T14:07:50+00:00"
 }

lib/datalog/scoreboard.md

@@ -1,6 +1,6 @@
 # datalog scoreboard
 
-**229 / 229 passing** (0 failure(s)).
+**230 / 230 passing** (0 failure(s)).
 
 | Suite | Passed | Total | Status |
 |-------|--------|-------|--------|
@@ -11,7 +11,7 @@
 | builtins | 20 | 20 | ok |
 | semi_naive | 8 | 8 | ok |
 | negation | 10 | 10 | ok |
-| aggregates | 19 | 19 | ok |
+| aggregates | 20 | 20 | ok |
 | api | 20 | 20 | ok |
 | magic | 28 | 28 | ok |
 | demo | 21 | 21 | ok |

lib/datalog/tests/aggregates.sx

@@ -244,6 +244,24 @@
           {:U (quote carol) :N 0}))
 
       ;; Stratification: recursion through aggregation is rejected.
+      ;; Indirect recursion through aggregation also rejected.
+      ;; q -> r (via positive lit), r -> q (via aggregate body).
+      ;; The aggregate edge counts as negation for stratification.
+      (dl-at-test! "indirect agg cycle rejected"
+        (dl-at-throws?
+          (fn ()
+            (let ((db (dl-make-db)))
+              (do
+                (dl-add-rule! db
+                  {:head (list (quote q) (quote N))
+                   :body (list (list (quote r) (quote N)))})
+                (dl-add-rule! db
+                  {:head (list (quote r) (quote N))
+                   :body (list (list (quote count) (quote N) (quote X)
+                                     (list (quote q) (quote X))))})
+                (dl-saturate! db)))))
+        true)
+
       (dl-at-test! "agg recursion rejected"
         (dl-at-throws?
           (fn ()