clap-tree 0.1.0

A personal helper crate to help me build CLIs. I do not recommend others to use it.
Documentation 
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{
  inputs = {
    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    rust-overlay.url = "github:oxalica/rust-overlay";
  };

  outputs = inputs:
    inputs.flake-utils.lib.eachDefaultSystem(system:
      let
        overlays = [(import inputs.rust-overlay)];
        pkgs = import inputs.nixpkgs-unstable { inherit system overlays; };
      in
      {
        devShells.default = pkgs.mkShell {
          packages = with pkgs; [
            (rust-bin.stable.latest.default.override {
              extensions = [ "rust-src" "rust-analyzer" ];
              targets = ["wasm32-unknown-unknown"];
            })
            gcc
            gdb
            nil
            openssl
            pkg-config
          ];
          PKG_CONFIG_PATH = "${pkgs.openssl.dev}/lib/pkgconfig";
        };
      }
    );
}