Test instruction on Homepage/Readme fail

[ikervagyok]

I wanted to try out std and the homepage says at the end of the start page:

This unfortunately doesn't work.

❯ git clone https://github.com/divnix/std.git
       ...
❯ direnv allow
       ...
       error: in pure evaluation mode, 'fetchTree' will not fetch unlocked input 'path:../../'

if I add --impure, to the nix command, the error changes to:

❯ nix build --profile /home/bali/Documents/HACKING/Repos/Nix/std/.data/local/shells/default/enter-action .#__std.actions.x86_64-linux.local.shells.default.enter --impure
       error: cannot fetch input 'path:../../' because it uses a relative path

---

I'm on NixOS unstable.

❯ nix --version
nix (Nix) 2.28.2