First spine increment of self-hosting the compiler on Chez. The IR->Scheme
emitter is host/chez/emit.janet (Janet); to get the analyzer emitting its own
code on Chez with no Janet, the emitter logic has to be portable Clojure that
cross-compiles and runs on Chez itself.
jolt-core/jolt/backend-scheme.clj ports the core ops: const/local/var/the-var/
if/do/let/loop/recur/invoke (+ native-ops)/fn/def, plus the chez-str-lit/flonum/
munge/truthy-elision helpers and prelude-mode. Output is Scheme source text, op-
for-op with emit.janet. recur-target/known-procs are dynamic vars (auto-restore,
no throw-leak). Quote, collection literals, try/throw, host interop, regex/inst/
uuid and program assembly come in later increments (they throw not-yet-ported).
Gate: test/chez/emit-parity.janet loads the Clojure emitter interpreted on the
Janet host and runs each case through it -> Chez -> compares to the Janet CLI
oracle. 18/18 incl fib, factorial loop, multi-arity, variadic, higher-order,
#() shorthand, the mandelbrot kernel. emit-test 331/331 (emit.janet path
untouched), conformance 355x3. jolt-hg7z.
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