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Sengoo v0.2.0

Sengoo v0.2.0 is the first stable native toolchain line built from the v0.2 mainstream program. It packages sgc, sgpm, sgfmt, sglsp, the standard library, and the native runtime for Windows x64, Linux x64, macOS x64, and macOS arm64.

Highlights

  • Automatic Drop, move checking, drop flags, aggregate cleanup, and dynamic trait dispatch on the supported native path.
  • Generic traits and collections, owned strings, numeric widths/conversions, formatting, Unicode scalar iteration, and stream composition.
  • Cooperative async, user futures, cancellation, structured task scopes, reactor-backed IO, generic channels, locks, and opt-in worker execution.
  • Deterministic package graphs with aliases and multiple versions, locked realworld loops, structured diagnostics, native source debugging, and self-contained release archives.
  • Production-shaped HTTP routing, bounded keep-alive and response streaming, plus verified TLS composition using Schannel on Windows and rustls on POSIX.

Compatibility

  • Source edition remains 2026.
  • Runtime ABI remains 1; generic collections descriptor ABI remains 1.
  • Sengoo.lock readers accept schemas 1 and 2; new dependency graphs write 2.
  • Stable v0.2 surfaces follow the deprecation and security/soundness exception rules in docs/compatibility-policy.md.
  • Migration details are in docs/migration-v0-1-to-v0-2.md.

Supported Hosts

Host Target
Windows x64 x86_64-pc-windows-msvc
Linux x64 x86_64-unknown-linux-gnu
macOS Intel x86_64-apple-darwin
macOS Apple Silicon aarch64-apple-darwin

Each published archive includes a SHA-256 sidecar and GitHub build-provenance attestation. The release workflow installs archives outside the checkout and runs compatibility, package, TLS, debugger/reactor, upgrade, and rollback smokes before publication.

Release Evidence

  • Candidate 1: f5a09c4baa83f539c5d7e889c9fce3d23e2b4289, run 30184545506.
  • Candidate 2: 6f9475dd956e63c886c8868278bc233a7044806b, run 30188454330.
  • Candidate 2 passed six same-SHA main workflows, four package jobs, and four RC1-to-RC2-to-RC1 transition jobs. Its public archives and evidence manifest are retained at the v0.2.0-rc.2 release.
  • Stable: 92c8f399f61b73d63990581c637da68572b6e133, run 30191226253, provenance attestation 37141681.
Target SHA-256
aarch64-apple-darwin e25b10df03f7aa49c5da6a31ebcbece1fd264fb031d162ec0496853ba2894842
x86_64-apple-darwin f46140b369e36e06e8834cb9bd81bcaca003e9eb29bca3978ecf657036e99562
x86_64-pc-windows-msvc 11baa4fc0819e4062d3fa134e928a6c244a30c4bb3d0a68007232ed12e0d31c3
x86_64-unknown-linux-gnu 3c041ddb8430c6d3d014e3a4aa93430985a3b8c74f9edf780c6e78cb02d52170

The stable evidence manifest records the six successful main-push workflows, four package jobs, four RC2-to-stable-to-RC2 transition jobs, frozen fixture hashes, and no platform skip.

Experimental or Deferred

  • WASM remains an experimental scalar backend; bytecode is not production GO.
  • Cranelift is an opt-in primitive fast-JIT, not the release-reference backend.
  • HTTP/2, WebSocket-over-TLS, request-body streaming, async middleware, broad database/web frameworks, and a hosted public package registry are not v0.2 Supported claims.

Install

.\scripts\install.ps1 -Version 0.2.0
sh scripts/install.sh --version 0.2.0