CODEWITHSUNDEEP
haskellfunctional-programming
GermanNab
GermanNab

Reputation: 43

Haskell case error

if i try to run this function : 

function :: Int -> Int -> Int
function = 
\case 5 -> 1

im getting this error message : 

parse error (possibly incorrect indentation or mismatched brackets)
Failed, modules loaded: none.

or this if i implement the function like this : 

function :: Int -> Int -> Int
    function = \case 5 -> 1
parse error on input ‘case’
Failed, modules loaded: none.

could anyone tell me why i am getting this error message?

Upvotes: 0

Views: 141

Answers (1)

AJF
AJF

Reputation: 11913

The \case (...) -> (...) syntax requires the language extension LambdaCase.

To set this in your file, either compile with the flag -XLambdaCase, or write this at the top of your file:

{-# LANGUAGE LambdaCase #-}

Note that non-GHC compilers may not support this extension.

Upvotes: 4

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