[aprokurov@nixos:~/go]$ nix-shell default.nix --show-trace
error: while evaluating the attribute ‘buildInputs’ of the derivation ‘development-env’ at /nix/var/nix/profiles/per-user/root/channels/nixos/pkgs/stdenv/generic/make-derivation.nix:98:11:
cannot coerce a set to a string, at /nix/var/nix/profiles/per-user/root/channels/nixos/pkgs/stdenv/generic/make-derivation.nix:98:11