#6032: HEAD (7.5.20120421) requires RankNTypes for a rank-2 type
    Reporter:  dreixel           |       Owner:  simonpj         
        Type:  bug               |      Status:  new             
    Priority:  normal            |   Milestone:  7.8.1           
   Component:  Compiler          |     Version:  7.5             
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  

Comment(by simonpj):

 Well it'd be odd to have "2" as a ''permanent'' alias for "arbitrary"
 wouldn't it?  Isn't this precisely what deprecation is for: everything
 works but you get a nudge saying "please change when it's convenient". In
 fact it *is* an alias for `RankNTypes` plus a deprecation message.

 We can keep supporting `Rank2Types` (as an alias for `RankNTypes`), with
 deprecation, for multiple releases.

 Or what?


Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6032#comment:6>
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