I don't think GHCi allows function and type definitions in interactive mode. You have to write the functions in a source file and then load it. You can then call the functions as usual. Homero Cardoso de Almeida On Thu, May 31, 2012 at 4:48 PM, Stan Kulp wrote:

I have been working my way through "Learn You a Haskell for Greater Good" and am stumped when I get to the "Syntax in Functions - Pattern Matching" section.

The book shows the following expression...

ghci> lucky :: (Integral a) => a -> **String

...but when I try to execute it in GHCi I get the following error...

<interactive>:1:1: Not in scope: `lucky'

What am I missing?

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Stan Kulp writes:

I have been working my way through "Learn You a Haskell for Greater Good" and am stumped when I get to the "Syntax in Functions - Pattern Matching" section.

The book shows the following expression...

ghci> lucky :: (Integral a) => a -> String

As far as I can see, the live version of `the section you mention`_ on learnyouahaskell.com does not contain this text - it doesn't have the "ghci> " at the beginning of the line. Besides what others have said in response to your question, I would add that you should make sure to read LYAH on the website if possible - other sources might be out of date, as I think the author does update the website version from time to time. .. _the section you mention: http://learnyouahaskell.com/syntax-in-functions#pattern-matching -Keshav