> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sifr.sh/llms.txt
> Use this file to discover all available pages before exploring further.

# Sifr 0.1.0

> Release notes for the first Sifr stable compiler and toolchain.

Sifr `0.1.0` is the first stable compiler release. It ships one qualified
compiler, sysroot, standalone installer, governed release-index record, and VS
Code compatibility contract.

## Highlights

* Python-shaped source compiles through Sifr's statically checked HIR and Rust
  backend to a native binary.
* Ownership, `Option`, and `Result` contracts reject unsafe or partial user
  paths during compilation.
* The standalone installer and `sifr self update` verify the governed immutable
  installer, target archive, and sysroot digests.
* `sifr.sifr-vscode` `0.2.0` provides editor diagnostics and formatting through
  the native `sifr lsp --stdio` server, plus compiler-backed check, lint, and
  test actions and a generated-Rust preview.
* Rust interop support is limited to the categories and evidence scopes in the
  [stable claims table](/rust-interop#stable-support-claims).

## Compatibility

The standalone release supports macOS 15.0 and glibc 2.39 on the four targets
listed in [stable compatibility](/releases/compatibility). The VS Code
extension advertises compiler range `>=0.1.0,<0.2.0`.

## Installation

```bash theme={null}
curl -fsSL https://sifr.sh/install | sh
sifr --version
```

For a pinned install:

```bash theme={null}
curl -fsSL https://sifr.sh/install/stable | sh -s -- --version 0.1.0
```

The governed release index uses `schema_version: 2`. Unknown, withdrawn, and
`-rc.N` versions are rejected.

## Known boundaries

* Windows standalone installation and package-manager distribution are not
  included.
* Alpha and beta remain explicit preview channels.
* Runtime work marked future-owned in the Rust compatibility matrix is not
  advertised as stable support.
* The first stable release has no rollback predecessor. A release incident
  recovers through a protected incident roll-forward.