[Haskell-beginners] ghci parse error on input

[Stephen Tetley]

On 18 March 2010 13:26, Chaddaï Fouché <chaddai.fouche at gmail.com> wrote:

>
> That's probably due to you using GHCi in a version where the
> GHC-specific extension concerning # is active by default (with this
> extension (# 2, 3 #) is an unboxed strict pair). While it's probably
> possible to compile this code by making sure that the extension isn't
> active (for instance, using ghc instead of ghci), it is probably a
> better idea to avoid # as an operator name.


True - if you use -fglasgow-exts rather than adding extensions
selectively it bring in the conflicting extension (probably
-XMagicHash)

If you surround the export and definition of the # function with
whitespace it should still work.


> module Export
>       (
>               (^)
>       ,       ( # )
>       )
> where
> import Prelude hiding ((^))