Re: [Haskell-beginners] Functions in "where" block.

On 06/12/2014 04:21 AM, Kim-Ee Yeoh wrote:

On Thu, Jun 12, 2014 at 8:54 AM, Venu Chakravorty wrote:

...

fun.hs:4:15: parse error on input `='

The problem wasn't obvious until I copy-pasted it into an editor:

You have tabs instead of spaces for the line defining ep.

The rule of thumb is that your editor must expand all tabs into matching spaces for whitespace-sensitive languages like haskell. Or else you'll waste time with this kind of parsing errors.

-- Kim-Ee

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For reference, GHC treats hard tabs as 8 spaces. Even in my mail client the problem is quite apparent[1]. Set your editor to use spaces only. I think [2] is the standard reference for whitespace style. [1]: http://fuuzetsu.co.uk/images/1402875503.png [2]: http://urchin.earth.li/~ian/style/haskell.html -- Mateusz K.