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rose-ash/lib/datalog/scoreboard.md
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datalog: rule-shape validators in dl-add-rule! (253/253)
Two malformed-rule paths used to slip through:

- Empty head list `{:head () :body ()}` was accepted; the rule
  would never fire but the relation-name lookup later returned
  nil with confusing downstream errors.
- Non-list body (`{:head (...) :body 42}`) crashed in `rest`
  during safety check with a cryptic "rest: 1 list arg".

dl-add-rule! now checks head shape (non-empty list with symbol
head) and body type (list) before any safety walk. Errors are
descriptive and surface at add time rather than during the next
saturation.

2 new eval tests.
2026-05-10 21:09:33 +00:00

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Markdown

# datalog scoreboard
**253 / 253 passing** (0 failure(s)).
| Suite | Passed | Total | Status |
|-------|--------|-------|--------|
| tokenize | 29 | 29 | ok |
| parse | 22 | 22 | ok |
| unify | 28 | 28 | ok |
| eval | 38 | 38 | ok |
| builtins | 23 | 23 | ok |
| semi_naive | 8 | 8 | ok |
| negation | 10 | 10 | ok |
| aggregates | 20 | 20 | ok |
| api | 20 | 20 | ok |
| magic | 34 | 34 | ok |
| demo | 21 | 21 | ok |