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Example Repo 
{
  "packages": ["rustup@latest", "libiconv@latest"],
  "shell": {
    "init_hook": [
      "projectDir=$(dirname $(readlink -f \"$0\"))",
      "rustupHomeDir=\"$projectDir\"/.rustup",
      "mkdir -p $rustupHomeDir",
      "export RUSTUP_HOME=$rustupHomeDir",
      "export LIBRARY_PATH=$LIBRARY_PATH:\"$projectDir/nix/profile/default/lib\"",
      "rustup default stable",
      "cargo fetch"
    ],
    "scripts": {
      "test": "cargo test -- --show-output",
      "start": "cargo run",
      "build-docs": "cargo doc"
    }
  }
}
To pin a specific version of Rust with Rustup, you can add a rust-toolchain.toml and check it into source control. Edit this page