Hi Daniel,
Thanks for the IO monad reminder. What is GHC.Int.Int32? Can't find it on Hoogle. Michael ================== *Main> ht <- new (==) dummy :: IO MyHashTable <interactive>:1:15: Couldn't match expected type `GHC.Int.Int32' against inferred type `Int' In the second argument of `new', namely `dummy' In a stmt of a 'do' expression: ht <- new (==) dummy :: IO MyHashTable *Main> :t dummy dummy :: String -> Int *Main> --- On Tue, 11/17/09, Daniel Fischer <daniel.is.fisc...@web.de> wrote: From: Daniel Fischer <daniel.is.fisc...@web.de> Subject: Re: [Haskell-cafe] Simple hash table creation To: haskell-cafe@haskell.org Date: Tuesday, November 17, 2009, 2:45 PM Am Dienstag 17 November 2009 20:36:46 schrieb Daniel Fischer: > What you probably wanted was > > type MyHashTable = HashTable String Int -- not data MyHashTable > Just in case it's not clear: > ht <- new (==) dummy :: IO MyHashTable only works at the prompt or in an IO do-block, not at the top level of the module. > > then ht is a hashtable of type MyHashTable. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
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