These are project templates for demonstrating development environments with Nix.
You can use nix flake init to get started, using e.g.:
mkdir hello-rs
cd hello-rs
nix flake init --template github:sshine/templates#rust-simple
But they are mainly intended for reading flake.nix for inspiration.
Provide a devShell with the Rust toolchain, nothing else.
You need to cargo build, cargo run, etc.
The flake does not export any packages.