[Haskell-beginners] Module name from a function name?

Karl Voelker ktvoelker at gmail.com
Thu Jul 25 06:49:09 CEST 2013

The problem is that length is defined in GHC.List and simple re-exported by
Data.List (and by Prelude).

You could try tying into a command-line installation of Hoogle. A quick
search for "length" on the Hoogle website shows that it finds it in both
Prelude and Data.List.


On Wed, Jul 24, 2013 at 8:27 PM, Jong-won Choi <oz.jongwon.choi at gmail.com>wrote:

> Hi,
> I am self-teaching Haskell and also try to fix a slightly broken Emacs
> mode for Haskell.
> I'd like to browse Haskell documentation from Emacs - C-c C-d on a
> function name, say.
> Current Emacs Lisp Haskell mode implementation uses return value of
> ':info', for example, GHC.List for length (the function name I want to
> browse).
> Unfortunately, this does not work because Glasgow Haskell's HTML doc
> uses module name Data.List(i.e. Data-List.html) instead of GHC.List.
> I'd like to get 'Data.List' from 'length'. How can I do this?
> For example, if it is Common Lisp, this can be achieved by:
> (symbol-package 'length)
> One more thing. I think :info command is only for GHC. Is there any
> portable ways which will work on other implementations as well?
> Thanks!
> - Jong-won Choi
> _______________________________________________
> Beginners mailing list
> Beginners at haskell.org
> http://www.haskell.org/mailman/listinfo/beginners
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