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assoc! fills nil for a trailing lone key (JVM parity)

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JVM assoc! is variadic: with a complete first pair present (>=3 kvs), a trailing
lone key fills nil ((assoc! t :a 1 :b) => {:a 1 :b nil}); a lone key alone (1 kv)
is still a wrong-arity throw. jolt delegated to the strict persistent assoc which
threw on any odd count. Pad a trailing nil for odd kvs >=3. Corpus 2688->2690.
This commit is contained in:
Yogthos 2026-06-21 17:03:10 -04:00
parent c788e86f1a
commit e7f5bcb58d
2 changed files with 9 additions and 3 deletions
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host/chez/transients.ss
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@ -38,7 +38,13 @@
;; (assoc! t k v & kvs): variadic like Clojure (jolt-assoc already folds pairs).
(define (jolt-assoc! t . kvs)
(jolt-trans-check t "assoc!")
(jolt-transient-coll-set! t (apply jolt-assoc (jolt-transient-coll t) kvs))
;; JVM assoc! is variadic: once a complete first key/val pair is present (>=3
;; kvs), a TRAILING lone key fills nil; a lone key alone (1 kv) is a wrong-arity
;; throw (so don't pad it — the persistent assoc raises on odd args).
(let ((kvs (if (and (>= (length kvs) 3) (odd? (length kvs)))
(append kvs (list jolt-nil))
kvs)))
(jolt-transient-coll-set! t (apply jolt-assoc (jolt-transient-coll t) kvs)))
t)
(define (jolt-dissoc! t . ks)
(jolt-trans-check t "dissoc!")