Start a nix-shell from unstable channel

Help
1

I want to use the latest version of hugo through a nix-shell
like so

nix-shell -p **hugo**

but I want the package from the unstable channel

how can I run that from unstable?

2 
nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz -p **hugo**

-I overrides the NIX_PATH which nix uses to look up the packages in.

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