I was expecting to get a result directory and to see "Hello" but I get
```
building '/nix/store/i2ib1jlkhj633a5m7jd1y7l9wnrap5yc-ihaskell-console.drv'...
building '/nix/store/b3bzyqkbjrayd5l1zh5gddy1783hqgz7-ihaskell-lab.drv'...
building '/nix/store/l8fdzvmf2d6c24dxczqpr7b89w7m3fbp-ihaskell-nbconvert.drv'...
building '/nix/store/s86bkkgkv8hijk6vaqidk9wb0d7d87ik-ihaskell-notebook.drv'...
```