How can I set up my Rust programming environment?

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FWIW here’s my shell.nix for rust stuff:

let
  # Last updated: 2/26/21. Update as necessary from https://status.nixos.org/...
  pkgs = import (fetchTarball("https://github.com/NixOS/nixpkgs/archive/04ac9dcd311956d1756d77f4baf9258392ee7bdd.tar.gz")) {};

  # Rolling updates, not deterministic.
  # pkgs = import (fetchTarball("channel:nixpkgs-unstable")) {};
in pkgs.mkShell {
  buildInputs = [
    pkgs.cargo
    pkgs.rustc
    pkgs.rustfmt

    # Necessary for the openssl-sys crate:
    pkgs.openssl
    pkgs.pkg-config
  ];

  # See https://discourse.nixos.org/t/rust-src-not-found-and-other-misadventures-of-developing-rust-on-nixos/11570/3?u=samuela.
  RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
}
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