_:
А вот так работает?
=> main λ (icr-backend) (, db-connetion, ⦿) = clear
=> main λ (icr-backend) (, db-connetion, ⦿) = NIX_PATH=nixpkgs= https://github.com/nixos/nixpkgs/archive/release-20.03.tar.gz nix-shell
zsh: no such file or directory: https://github.com/nixos/nixpkgs/archive/release-20.03.tar.gz
=> main λ (icr-backend) (, db-connetion, ⦿) = NIX_PATH=nixpkgs=https://github.com/nixos/nixpkgs/archive/release-20.03.tar.gz nix-shell
error: getting status of '/nix/store/xjn1qc7b6b88pfrpcrrg3ibzk1k2nxp2-nixos-unstable-2020-05-16': No such file or directory
(use '--show-trace' to show detailed location information)
=> main λ (icr-backend) (, db-connetion, ⦿) =