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datalog: aggregate validates that agg-var appears in goal

`count(N, Y, p(X))` silently returned `N = 1` because `Y` was never
bound by the goal — every match contributed the same unbound symbol
which dl-val-member? deduped to a single entry. Similarly:

  sum(S, Y, p(X))    => raises "expected number, got symbol"
  findall(L, Y, p(X)) => L = (Y)  (a list containing the unbound symbol)
  count(N, Y, p(X))   => N = 1    (silent garbage)

Added a third validator in dl-eval-aggregate: the agg-var must
syntactically appear among the goal's variables. Error names the
variable and the goal and explains why the result would be
meaningless.

1 new test; conformance 263/263.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-11 07:57:01 +00:00

421 B

Raw Blame History

datalog scoreboard

263 / 263 passing (0 failure(s)).

Suite	Passed	Total	Status
tokenize	30	30	ok
parse	22	22	ok
unify	29	29	ok
eval	39	39	ok
builtins	23	23	ok
semi_naive	8	8	ok
negation	10	10	ok
aggregates	23	23	ok
api	22	22	ok
magic	36	36	ok
demo	21	21	ok

421 B Raw Blame History

datalog scoreboard

421 B

Raw Blame History