Haskell platform proposal: split package

Brent Yorgey byorgey at seas.upenn.edu
Sat Jul 21 20:15:45 CEST 2012

On Sat, Jul 21, 2012 at 04:37:48PM +0200, Gábor Lehel wrote:
> On Sat, Jul 21, 2012 at 2:13 PM, Simon Hengel <sol at typeful.net> wrote:
> >> An unrelated suggestion: you can give type signatures to the various
> >> functions which are synonyms of each other as a group and they will
> >> show up as a single item in the Haddocks.
> >
> > Have you tried this a recent version of Haddock?  I think this was only
> > in the Haddock version that was released with GHC 7.2 (introduced due to
> > a change in GHC).  But it had issues with explicit export lists, so we
> > now always expand such signatures.
> >
> > Cheers,
> > Simon
> It seems to work with Haddock 2.10 / GHC 7.4. I remember I initially
> tried it with whatever old version of Haddock I had installed and I
> was annoyed that it didn't work (it got split into two declarations
> with one of them missing documentation entirely -- quite suboptimal),
> but then following a suggestion I tried it again with GHC 7.4 and was
> happy that it seemed to have improved and gave the expected behaviour,
> and impressively even worked across module boundaries. I would be sad
> if it stopped working again. :)

Indeed, from the CHANGES file in the haddock distribution:

  Changes in version 2.9.3:

    * A type signature for multiple names generates one signature in the output

Neato, I didn't know about this feature.  I think grouping synonyms
together like this is a good idea.


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