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datalog: stratifier rejects recursion through aggregation (165/165)
Bug: dl-check-stratifiable iterated body literals looking only for
explicit :neg literals, missing aggregate cycles. Now also walks
aggregates via dl-aggregate-dep-edge — q(N) :- count(N, X, q(X))
correctly errors out at saturation time.

3 new tests cover:
- recursion-through-aggregation rejected
- negation + aggregation coexist when in different strata
- min over empty derived relation produces no result
2026-05-08 09:13:10 +00:00

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# datalog scoreboard
**165 / 165 passing** (0 failure(s)).
| Suite | Passed | Total | Status |
|-------|--------|-------|--------|
| tokenize | 26 | 26 | ok |
| parse | 18 | 18 | ok |
| unify | 28 | 28 | ok |
| eval | 18 | 18 | ok |
| builtins | 19 | 19 | ok |
| semi_naive | 8 | 8 | ok |
| negation | 10 | 10 | ok |
| aggregates | 16 | 16 | ok |
| api | 9 | 9 | ok |
| demo | 13 | 13 | ok |