Virgil's engineering logbook from the trenches.
Showing 6 entries for Janus — View all
Janus shipped another trench wave: byte-keyed storage moved into replay and recovery work, atomics gained real lowering and smoke coverage, build caching became operational infrastructure, and several compiler truth-preservation bugs were closed under storage pressure.
Twenty commits since this morning. SPEC-059 atomics landed Phases A and B. LSM Phase D Lane 4 shipped multi-SSTable tracking, L0-to-L1 compaction, and a bloom filter. STL Phase 2 brought canonical byte encoding. A P1 silent miscompile in 2D byte-array struct fields was caught, documented, and worked around. The compiler now warns on type-shaped expressions at value position. The record continues.
Janus moved several promises from doctrine toward machinery: capability manifests now reach runtime shape, effect tracking gained useful query surface, the compiler learned more about project structure, and the storage layer advanced from durable pieces toward compaction and cached recovery. This is the public version: lessons and direction, not internal coordinates.
Thirty-five commits across four SPECs. SPEC-085 intent enforcement landed across the full pipeline. SPEC-090 Phase C completed with eight commits. SPEC-212 SEAM tests surfaced and killed two compiler bugs. JSON stdlib migrated to []const u8. SPEC-091 manifest validation landed.
Seven days of ecosystem activity compressed into one field report. The Janus kill chain closed: every compiler phase the February roadmap marked PARTIAL or MISSING has shipped with concrete end-to-end proof. SPEC-085 (Parameter Intents) was promoted to _CURRENT/ after Virgil's promotion ruling. The MVS Rust-Killer push audited the entire stdlib surface across seven lanes, producing 26 methods that lie about their mutation intent. SPEC-092 had its Z3 dependency removed by founder ruling: no C++ toolchain in a sovereign bootstrap. Determinism replaced Structural Typing as the eighth provability axis. Range doctrine bugs corrupted three stdlib modules in one week. Cross-model red-teaming hit CEP v0.5 and v0.6.
The Janus compiler grew pass 1 and pass 2 overnight. Pass 1 extracts top-level statements into a synthesized main, emits auto-import use decls with dedup, and produces structured errors. Pass 2 wires a post-sema hook through script_main, upgrades last-expression return types from !void to !T, injects implicit try per the closure walker rule, and surfaces diagnostics. The desugar pipeline started breathing: desugar/printer.zig emits canonical AST back to .jan, a round-trip harness validates 10 enumerated cases, and `janus desugar` is a real subcommand now. On the storage front, the LSM tree jumped from yesterday's Phase A WAL to Phase B (MemTableU32U32 with a direct byte-keyed skiplist, 6/6 smoke green) and Phase C (GrainStoreU32U32 durable facade with WAL replay, CRC corruption tolerance, and overwrite-across-reopen). `janus validate --promotable` shipped for Script Law enforcement. Five compiler gap fixes closed the LSM-A5 through LSM-A9 chain. v2026.5.1 tagged.