nix-mode

(fhsenv "let" n
        > "pkgs = import " (p "<nixpkgs>") " { };" n
        > "fhs = pkgs.buildFHSUserEnv {" n
        > "name = \"" (p "env") "\";" n
        > "targetPkgs = _: [ " q " ];" n
        > "profile = \"\";" n
        > "};" n
        "in" n
        > "fhs.env")

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