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Tagged literals are value-equal

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(tagged-literal t f) compared by identity, so two equal tagged literals were not
= and didn't dedup as map keys / set members; JVM's TaggedLiteral is value-equal.
Add a register-eq-arm! for jtagged (tag + recursive form); hash is already
structural. Fixes an infinite loop in any fixpoint that dedups structures
containing tagged literals (e.g. aero's #ref expansion).
This commit is contained in:
Yogthos 2026-06-24 11:03:33 -04:00
parent b2bc52935d
commit 3412563a79
1 changed files with 7 additions and 0 deletions
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7
host/chez/natives-misc.ss
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@ -82,6 +82,13 @@
(else d))))
(define (jtagged-pr t) (string-append "#" (jolt-pr-str (jtagged-tag t)) " " (jolt-pr-readable (jtagged-form t))))
(register-pr-arm! jtagged? jtagged-pr)
;; two tagged literals are = iff same tag and (recursively) = form, like the JVM's
;; TaggedLiteral — so they work as map keys / set members. (jolt-hash already
;; hashes the fields structurally, so eq/hash stay consistent.)
(register-eq-arm! (lambda (a b) (or (jtagged? a) (jtagged? b)))
(lambda (a b) (and (jtagged? a) (jtagged? b)
(jolt=2 (jtagged-tag a) (jtagged-tag b))
(jolt=2 (jtagged-form a) (jtagged-form b)))))
(def-var! "clojure.core" "tagged-literal" jolt-tagged-literal)
;; tagged-literal? is OVERLAY (reads :jolt/type) — asserted in post-prelude.ss.