On Thu, May 31, 2012 at 3:48 PM, Stan Kulp
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?
ghci is intended for interactive evaluation; it doesn't (currently; this might change in future versions) do declarations the same way you would in a source file. You can still do them with do-style let binding: Prelude> let lucky :: (Integral a_ => a -> String; lucky = ... (This all has to fit on a single line unless you use braces and have done ":set +m"; this may also require a recent GHC.) -- brandon s allbery allbery.b@gmail.com wandering unix systems administrator (available) (412) 475-9364 vm/sms