bali-phy: Error! [1mMain.hs:7.7-15:[1;31m error:[0m[1m
   • pattern binding failed pattern match
  [1;34m|[0m
[1;34m7[0m [1;34m| [0m  let [1;31m!(Just x)[0m = Nothing
  [1;34m|[0m       [1;31m^^^^^^^^^[0m

