1. [Learn Nix](https://nixos.org/learn/) if you haven't yet.
2. Until I learn how to use Bazel modules defined within other modules, I need
   a local copy of `rules_nixpkgs`. I use something like `git submodules add
   https://github.com/tweag/rules_nixpkgs`.
3. Run `nix develop` to launch a shell with Nix-provided Bazel.
4. Run the demo: `bazel run :main_cc`

```
Hello, from Go!
Hello, from Rust!
Hello, from C++!
```

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SPDX-License-Identifier: Apache-2.0