bali-phy: Error! [1mMain.hs:10.13-18:[1;31m error:[0m[1m
   • pattern match failure in lambda
   [1;34m|[0m
[1;34m10[0m [1;34m| [0m  let f = \([1;31mJust x[0m) -> x
   [1;34m|[0m             [1;31m^^^^^^[0m

