Add a Rust port where branches are enum variants

.github/workflows/ci.yml

@@ -20,3 +20,21 @@ jobs:
       - run: uv run ruff check .
       - run: uv run ruff format --check .
       - run: uv run pytest -q
+
+  rust:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: rust
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy, rustfmt
+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: rust
+      - run: cargo fmt --check
+      - run: cargo clippy --locked --all-targets -- -D warnings
+      - run: cargo clippy --locked --no-default-features -- -D warnings
+      - run: cargo test --locked

.gitignore

@@ -8,3 +8,6 @@ wheels/
 
 # Virtual environments
 .venv
+
+# Rust build output
+/rust/target

README.md

@@ -25,6 +25,9 @@ A Python `match` statement dispatches on the *shape* of a value. `fuzzymatch` di
 value *means*, and it keeps what makes `match` trustworthy: a fixed set of arms, guards, and a
 `case _` fallback.
 
+There is also a [Rust port](rust/README.md), where the branches are variants of your own enum and
+the compiler checks that every outcome is handled.
+
 > **Status: proof of concept.** The request and response mapping is tested through the real TypeSafe
 > SDK with only the HTTP layer mocked, but it has not yet been run against the live API. See
 > [Limits](#limits).
@@ -148,7 +151,7 @@ uv run pytest
 - `async` matchers on `AsyncTypeSafeClient`
 - an `escalate_to=` decider, so uncertain calls go to a frontier model automatically
 - a small tool that replays observer logs to suggest per-branch thresholds
-- nested matchers for hierarchical routing, and a TypeScript port
+- nested matchers for hierarchical routing, and a TypeScript port (a [Rust port](rust/README.md) exists)
 
 ## License