[Haskell-beginners] How to include {-# LANGUAGE LambdaCase #-} at the ghci prompt

[Galaxy Being]

Exactly. Thanks.

On Fri, Mar 26, 2021 at 12:33 PM Francesco Ariis <fa-ml at ariis.it> wrote:

> Il 26 marzo 2021 alle 12:20 Galaxy Being ha scritto:
> > I've got this code I've entered into the ghci by hand between :{ and :}
> >
> > :{
> > {-# LANGUAGE LambdaCase #-}
> > data List a = Empty | Cons a (List a) deriving (Eq, Ord, Show)
> > infixr 5 `Cons`
> >
> > subst_c :: (a -> Bool)  -> (a, MyList a) -> MyList a
> > subst_c pred = \ case
> >                      (_, Empty)    -> Empty
> >                      (n, Cons e t)
> >                        | pred e    -> Cons n $ subst_c pred (n, t)
> >                        | otherwise -> Cons e $ subst_c pred (n, t)
> > :}
> >
>
>     λ> :set -XLambdaCase
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