Issue on page /tutorials/first-steps/declarative-shell.html | Setting environment variables

Description

I encountered a syntax error while trying to set an environment variable in nix-shell using the your provided example:

let
nixpkgs = fetchTarball "https://github.com/NixOS/nixpkgs/tarball/nixos-23.11";
pkgs = import nixpkgs { config = {}; overlays = []; };
in

pkgs.mkShellNoCC {
packages = with pkgs; [
cowsay
lolcat
];

• GREETING = "Hello, Nix!";
  }

Error Message

`error: syntax error, unexpected '+'

   at /home/mboss37/nix-configs/shell.nix:12:1:

       11|
       12| +  GREETING = "Hello, Nix!";
         | ^
       13|  }

`

On the same page you have another shellHook example that causes the same issue.
Removing the + resolves the syntax error, but I want to confirm if this is the correct approach or if there's a better way to set environment variables.

Thanks!

Open tutorials/first-steps/declarative-shell.html and read the environment-variable and shellHook examples around the reported syntax error. Verify the examples are valid Nix expressions and that the documented environment-variable approach works when evaluated in nix-shell.