[Nix-dev] nix-shell is unable to install the package which nix-env just returned

[Dmitry Malikov]

>> nix-env -qaP '*' | grep letsencrypt
nixpkgs.letsencrypt
 letsencrypt-0.4.0

>> nix-shell -p letsencrypt
error: undefined variable ‘letsencrypt’ at (string):1:66
(use ‘--show-trace’ to show detailed location information)


What am I missing here?
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