multiline-repl-definition

Most of the time, you can rely on type inference to work out a signature for you. In your example, the following is sufficient: Prelude> let addTwo x y = x + y If you really want a definition with a type signature, or your definition spans over multiple lines, you can do this in … Read more

GHCi now has a multiline-input mode, enabled with :set +m. For example, Prelude> :set +m Prelude> let fac 0 = 1 Prelude| fac n = n * fac (n-1) Prelude| Prelude> fac 10 3628800