In Functional Programming, is it considered a bad practice to have incomplete pattern matchings

Question

Is it generally considered a bad practice to use non-exhaustive pattern machings in functional languages like Haskell or F#, which means that the cases specified don\'t cove

Answer 1

The Haskell prelude (standard functions) contains many partial functions, e.g. head and tail only work on non-empty lists, but don't ask me why.