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Chez Phase 1 (increment 3n): seq-native shims + reduced

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The dominant prelude-parity crash bucket was 'apply non-procedure jolt-nil':
core fns calling seed-native seq fns (core_coll.janet) that have no Chez RT
shim, so var-deref returns jolt-nil. A static scan of the assembled prelude
turned up 52 referenced-but-undefined clojure.core names.

host/chez/natives-seq.ss shims the safe seq fns over the existing seq layer:
mapcat, take-while, drop-while, partition (collection arities only — the 1-arg
transducer forms are jolt-kxsr), and sort (compare default; a comparator may
return a 3-way number or a boolean less-than). reduced/reduced? is a jolt-reduced
record in seq.ss that reduce short-circuits on and deref unwraps, so unreduced
works. identical? = jolt= (the seed's definition).

Deferred list?: a Chez lazy seq and a list are both cseq, so it can't be told
apart without a distinct list type — a real divergence risk.

Parity 1407 -> 1467/2497, 0 new divergences. emit-test 263/263.
This commit is contained in:
Yogthos 2026-06-17 23:16:26 -04:00
parent c28b5406ca
commit 739b219d0e
7 changed files with 183 additions and 11 deletions
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host/chez/rt.ss
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@ -160,3 +160,8 @@
;; extends get/count/contains? to see through a transient. After collections.ss
;; (the persistent ops it delegates to).
(load "host/chez/transients.ss")
;; seq-native shims (jolt-y6mv): mapcat/take-while/drop-while/partition/sort +
;; reduced/reduced?/identical? — seed-native fns the overlay assumes are core
;; natives. Over the seq layer + jolt-compare, so loaded after converters.ss.
(load "host/chez/natives-seq.ss")