➜  Logic 1.2.18 (64-bit) nix-shell ~/fhs-env.nix --show-trace                                                 [lejonet@achilles][14:18]
error: while evaluating the attribute 'shellHook' of the derivation 'ctf-env-shell-env' at /home/lejonet/sources/builddirs/my-nixpkgs/pkgs/stdenv/generic/make-derivation.nix:148:11:
while evaluating the attribute 'text' of the derivation 'ctf-env-init' at /home/lejonet/sources/builddirs/my-nixpkgs/pkgs/stdenv/generic/make-derivation.nix:148:11:
while evaluating the attribute 'buildCommand' of the derivation 'ctf-env-fhs' at /home/lejonet/sources/builddirs/my-nixpkgs/pkgs/stdenv/generic/make-derivation.nix:148:11:
while evaluating the attribute 'passAsFile' of the derivation 'ctf-env-usr-target' at /home/lejonet/sources/builddirs/my-nixpkgs/pkgs/stdenv/generic/make-derivation.nix:148:11:
cannot convert a function to JSON