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Chez Phase 2 (inc R): . / .-field dot-form desugar (jolt-kuic)

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The analyzer lowers the `.` special form (. target member arg*) and the
.-field field-access head to a :host-call instead of leaving them
uncompilable. Janet behaviour is unchanged — its back end punts :host-call
to the interpreter, which re-runs the original `.` form via eval-dot.

The Chez back end routes a non-shimmed :host-call through
record-method-dispatch, extended by a new host/chez/dot-forms.ss with the
arms dispatch-member covers but the record/string base did not, mirroring
src/jolt/interop/collections.janet precedence:

  - collection interop first (count/seq/nth/get/valAt/containsKey on a
    vector/map/set), so (. {:count 9} count) is the entry count like the seed
  - field access for a "-name" member (records and maps)
  - the seed's universal object-methods (getMessage/getCause/toString/
    hashCode/equals) on a non-record map, winning over a field lookup
  - non-record map member: a stored fn is a method called with self, else
    the field value

Raw seqs are excluded from coll interop — the seed's behaviour there is
representation-dependent (plain (seq v) vs a lazy-seq) and a normalized cseq
can't mirror it. Also added getMessage/getLocalizedMessage/equals to the
string method surface so a thrown string / Exception. ctor (which keeps the
message string) answers .getMessage.

Parity 2134 -> 2150, 0 new divergences. New test/chez/_dotform.janet 26/26;
emit-test 331/331.
This commit is contained in:
Yogthos 2026-06-19 00:32:30 -04:00
parent c90c4cb610
commit 1f96351acb
8 changed files with 224 additions and 2 deletions
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9
test/chez/run-corpus-prelude.janet
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@ -233,8 +233,15 @@
# exception constructors. Also emit now evaluates collection-literal elements
# left-to-right (emit-ordered), which un-allowlisted the 6 eval-order cases.
# java.time formatting / edn-read-over-readers / slurp-over-readers deferred) 2134.
# jolt-kuic (the `.` special form + `.-field` desugar — the analyzer lowers
# (. target member arg*) and (.-field target) to :host-call; the Chez RT
# dispatches them through record-method-dispatch, extended by dot-forms.ss with
# collection interop (count/nth/get/valAt/containsKey), field access, non-record
# map member dispatch, and the seed's universal object-methods getMessage/getCause/
# toString/hashCode/equals. Also added getMessage/getLocalizedMessage/equals to the
# string method surface so a thrown string / Exception. ctor answers .getMessage) 2150.
# Strided runs scale down.
(def base-floor (scan-number (or (os/getenv "JOLT_CHEZ_PRELUDE_FLOOR") "2134")))
(def base-floor (scan-number (or (os/getenv "JOLT_CHEZ_PRELUDE_FLOOR") "2150")))
(def floor (if (os/getenv "JOLT_CORPUS_LIMIT") 0 base-floor))
(when (or (> (length diverged) 0) (< pass floor))
(printf "REGRESSION: pass %d < floor %d or %d new divergence(s)" pass floor (length diverged)))