[Haskell-beginners] Problem with do statement

[Chaddaï Fouché]

On Sat, Jul 2, 2011 at 1:47 AM, Michael Litchard <michael at schmong.org> wrote:
> I received an error message that might be due to indentation,
> and not what the error message claims.
>
> Here's the error, then the code. Below that I have some comments.
>
> ghc --make CreateSession.lhs
> [2 of 3] Compiling HtmlParsing      ( HtmlParsing.lhs, HtmlParsing.o )
>
> HtmlParsing.lhs:81:5:
>    The last statement in a 'do' construct must be an expression:
>    let makeIDPage = do { initial }
>
>
>> generateResourceHtml :: Curl -> String -> String -> FilePath -> IO (Either String String)
>> generateResourceHtml curl user pass ipFile = do
>>   urlSequence <- popURLrec ipFile
>>   let makeIDPage = do
>>       initial = urlInitial urlSequence
>>       login = urlLogin urlSequence

you can't write "initial = url..." directly in a do construct. You
have to introduce any definition with a let. Here Haskell read it
"makeIDPage = (do initial) = urlInitial urlSequence...'" which doesn't
make sense at all.

-- 
Jedaï