GHCi doesn't quite support everything you could put in a source file. To do what you want here, you need to use Haskell's alternative block syntax:

:{
let { digs 0 = [0]
    ; digs x = (digs (x `div` 10)) ++ [(x `rem` 10)]
    }
:}

...yep, curly braces and semicolons just like C-family. :) It's intended for machine-generated code, but works for this too. And in fact you actually don't need multi-line, this is legal:

let { digs 0 = [0]; digs x = (digs (x `div` 10)) ++ [(x `rem` 10)] }


On Sat, Nov 14, 2015 at 9:35 PM, <amindfv@gmail.com> wrote:
In ghci you want to make a multi-line expression:

:{
let digs 0 =[0]
    digs x = (digs (x `div` 10)) ++ [(x `rem` 10)]
:}

(Note we don't put "let" on the second line)

tom


> El 13 nov 2015, a las 01:47, akash g <akaberto@gmail.com> escribió:
>
> let digs 0 =[0]
> let digs x = (digs (x `div` 10)) ++ [(x `rem` 10)]
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