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jolt/host/chez/seed
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Yogthos 6abbea3835 Fix 4 clojure.core bugs surfaced by JVM certification 
The corpus certifier (test/conformance) flagged four cases where jolt's
hand-written :expected matched a real defect rather than Clojure. Fixed in the
jolt-core overlay, corrected the spec :expected, re-certified against JVM Clojure:

- ex-message: returns nil for a non-throwable (dropped the lenient string branch);
  still returns the message for ex-info. (jolt-l8e8)
- munge: preserves the argument's type — a symbol munges to a symbol, not a string.
  (jolt-hc35)
- print: (print nil) emits "nil", not "" (top-level nil guard; str yields "").
  (jolt-pqio)
- bounded-count: uses the counted? fast path (full count), else counts up to n via
  seq — was (min n (count coll)), wrong for counted colls. Added an uncounted-coll
  spec case. (jolt-2507)

Removed the 4 :bug entries from known-divergences.edn (now certified), regenerated
corpus + profile, re-minted the Chez bootstrap seed (clojure.core changed). Gates:
Janet 155/0, JVM certify clean, both Chez corpus gates 2534 (floors raised),
bootstrap 6/6, fixpoint intact.
2026-06-20 11:06:33 -04:00
..
image.ss Fix 4 clojure.core bugs surfaced by JVM certification 2026-06-20 11:06:33 -04:00
prelude.ss Fix 4 clojure.core bugs surfaced by JVM certification 2026-06-20 11:06:33 -04:00
README.md Chez Phase 3 inc9a: self-contained Chez bootstrap (no Janet in the loop) 2026-06-20 06:46:05 -04:00

README.md

Chez bootstrap seed

These two files are the bootstrap compiler for jolt-on-Chez — the seed that makes the build self-hosting with no Janet in the loop:

  • prelude.ss — the clojure.core prelude (all tiers + clojure.string/walk/ template/edn/set/pprint) as Scheme def-var! forms.
  • image.ss — the compiler image (jolt.ir + jolt.analyzer + jolt.backend-scheme) as Scheme def-var! forms.

Both are generated, not hand-written. They are checked in because a fresh checkout must be able to build jolt-on-Chez using only Chez: host/chez/bootstrap.ss loads this seed, then rebuilds the prelude + image from the .clj/.ss sources via the on-Chez compiler (read → analyze → emit, all on Chez). The seed is a joint byte-fixpoint: rebuilding from an up-to-date seed reproduces it exactly (test/chez/bootstrap-test.janet verifies this).

Janet was used once, historically, to mint the very first seed (the Janet analyzer/ emitter cross-compiled the sources, then the on-Chez compiler iterated to the fixpoint — see test/chez/fixpoint-test.janet). After that, Janet is never needed to build or run jolt-on-Chez.

Re-minting

When the seed sources change (the core tiers, the compiler namespaces, the host contract, the reader, emit-image.ss), the seed drifts and bootstrap-test fails. Re-mint it:

(import host/chez/driver :as d)
(import host/chez/jolt-chez :as jc)
(def ctx (d/make-ctx))
(d/mint-chez-seed* (jc/ensure-prelude ctx)
                   (d/ensure-compiler-image ctx "/tmp/stage1.ss")
                   "host/chez/seed/prelude.ss"
                   "host/chez/seed/image.ss")

Then commit the refreshed prelude.ss / image.ss.