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Author	SHA1	Message	Date
Yogthos	d16e1f4eba	Step 4: lazy mapcat overlay — eliminate apply forcing on infinite inputs mapcat in 10-seq.clj now uses a defn- mapcat-step helper that walks lazy map results element-by-element (cons + lazy-seq), with explicit arities for 1/2/3/4+ colls. The 4+-coll arity still uses apply to spread colls to map, but apply no longer forces the inner map result. Previously (apply concat (apply map f colls)) forced the lazy map result through core-apply realize-for-iteration, which hung on infinite inputs. The new step-based impl walks one element at a time via first/rest/seq primitives. Re-enabled deferred mapcat infinite-input harness case. 19/19 pass. Gates: lazy-infinite 19/19, conformance 229/229 interpret+self-host (compile 228/229 — 1 pre-existing protocol error), specs 32/32.	2026-06-08 08:14:59 -04:00
Yogthos	e2e189acfe	Phase 5: true laziness — lazy transformers + deadlined harness jolt-c09 (partial, Steps 0–2d complete). Lazy combinator layer (Step 1): - lazy-cons: build a LazySeq cell from val + rest-thunk (phm.janet) - lazy-from: coerce any seqable to lazy view without forcing (core.janet) - core-seq: check ls-first emptiness, not ls-seq realization (core.janet) Lazy transformers (Steps 2a–2d): Converted in Janet core.janet (lazy branches preserving transducer arities): drop-while, interpose, distinct, partition, partition-all, keep, keep-indexed, map-indexed, take-nth Moved to Clojure overlay (jolt-core): interleave (20-coll.clj) — lazy multi-arity, matches Clojure mapcat (10-seq.clj) — transducer arity + standard (apply concat (apply map f colls)) Safety net (Step 0): test/support/lazy-eval.janet — subprocess worker for Clojure eval test/integration/lazy-infinite-test.janet — deadlined harness (os/spawn + 5s) Multi-input map/mapcat tests (Step 2d): sequences-spec.janet +9 tests, verified against Clojure/CLJS references Gates: lazy-infinite: 18/18 (mapcat on infinite inputs hangs — apply forces, needs Step 4) conformance: 229/229 ×3 (interpret/compile/self-host) specs: 32/32 files, 0 failures	2026-06-08 00:40:56 -04:00

Author

SHA1

Message

Date

Yogthos

d16e1f4eba

Step 4: lazy mapcat overlay — eliminate apply forcing on infinite inputs

mapcat in 10-seq.clj now uses a defn- mapcat-step helper that walks
lazy map results element-by-element (cons + lazy-seq), with explicit
arities for 1/2/3/4+ colls. The 4+-coll arity still uses apply to
spread colls to map, but apply no longer forces the inner map result.

Previously (apply concat (apply map f colls)) forced the lazy map
result through core-apply realize-for-iteration, which hung on
infinite inputs. The new step-based impl walks one element at a time
via first/rest/seq primitives.

Re-enabled deferred mapcat infinite-input harness case. 19/19 pass.

Gates: lazy-infinite 19/19, conformance 229/229 interpret+self-host
(compile 228/229 — 1 pre-existing protocol error), specs 32/32.

2026-06-08 08:14:59 -04:00

Yogthos

e2e189acfe

Phase 5: true laziness — lazy transformers + deadlined harness

jolt-c09 (partial, Steps 0–2d complete).

Lazy combinator layer (Step 1):
- lazy-cons: build a LazySeq cell from val + rest-thunk (phm.janet)
- lazy-from: coerce any seqable to lazy view without forcing (core.janet)
- core-seq: check ls-first emptiness, not ls-seq realization (core.janet)

Lazy transformers (Steps 2a–2d):
Converted in Janet core.janet (lazy branches preserving transducer arities):
  drop-while, interpose, distinct, partition, partition-all,
  keep, keep-indexed, map-indexed, take-nth

Moved to Clojure overlay (jolt-core):
  interleave (20-coll.clj) — lazy multi-arity, matches Clojure
  mapcat (10-seq.clj) — transducer arity + standard (apply concat (apply map f colls))

Safety net (Step 0):
  test/support/lazy-eval.janet — subprocess worker for Clojure eval
  test/integration/lazy-infinite-test.janet — deadlined harness (os/spawn + 5s)

Multi-input map/mapcat tests (Step 2d):
  sequences-spec.janet +9 tests, verified against Clojure/CLJS references

Gates:
  lazy-infinite: 18/18 (mapcat on infinite inputs hangs — apply forces, needs Step 4)
  conformance: 229/229 ×3 (interpret/compile/self-host)
  specs: 32/32 files, 0 failures

2026-06-08 00:40:56 -04:00

2 commits