deprecating

[Ian Lynagh]

On Fri, Oct 19, 2012 at 04:53:32PM +0000, Simon Peyton-Jones wrote:
> See my response on http://hackage.haskell.org/trac/ghc/ticket/6032#comment:6
> Not sure what the best path is here

FWIW, I agree with Simon.

And even if Rank2Types /is/ left as a permanent alias, I don't see a
reason not to make the change in Cabal.

Also, if you do want to take figures into account when considering this
sort of change, then I think a better figure than "number of modules"
would be "number of packages which compile with GHC 7.4/7.6" (or perhaps
"number of packages uploaded within the last year" would be easier to
measure and good enough).

> | > As discussed in Trac #6032 I am deprecating
> | >
> | >           Rank2Types
> | >
> | >           PolymorphicComponents
> | >
> | > in favour of the single flag
> | >
> | >           RankNTypes
> | 
> | I'm fine with making the changes to cabal, but before I do, I want to
> | make sure that we really want to do this. I did a quick investigation
> | of how many modules need to be updated on Hackage. It's about 775.
> | That will require quite a lot of work by quite a lot of people. Could
> | we instead have Rank2Types be an alias for RankNTypes?


Thanks
Ian