{ inputs = { nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable"; rust-overlay.url = "github:oxalica/rust-overlay"; flake-utils.url = "github:numtide/flake-utils"; }; outputs = { self, nixpkgs, rust-overlay, flake-utils, ... }: flake-utils.lib.eachDefaultSystem (system: let overlays = [ (import rust-overlay) ]; pkgs = import nixpkgs { inherit system overlays; }; myRust = pkgs.rust-bin.stable.latest.default; in { devShell = pkgs.mkShell { buildInputs = with pkgs; [ nixpkgs-fmt rust-analyzer myRust ]; RUST_SRC_PATH = "${pkgs.rust-bin.stable.latest.rust-src}/lib/rustlib/src/rust/library"; }; }); }