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The easiest way to manage Rust with Devbox is to install rustup, and then configure the channel you wish to install via Devbox's init_hook. You can also use the init_hook to configure rustup to install the Rust toolchain locally.

Example Repo

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"packages": [
"shell": {
"init_hook": [
"projectDir=$(dirname $(readlink -f \"$0\"))",
"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.