[GHC] #11669: Incorrectly suggests RankNTypes for ill-formed type "forall a. Eq a. Int"

[GHC]

#11669: Incorrectly suggests RankNTypes for ill-formed type "forall a. Eq a. Int"
-------------------------------------+-------------------------------------
           Reporter:  Iceland_jack   |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 {{{
 baldur at Loki:~$ ghci -ignore-dot-ghci
 GHCi, version 8.1.20160117: http://www.haskell.org/ghc/  :? for help
 Prelude> let foo :: forall a. Eq a. Int; foo = undefined

 <interactive>:1:20: error:
     Illegal symbol '.' in type
     Perhaps you intended to use RankNTypes or a similar language
     extension to enable explicit-forall syntax: forall <tvs>. <type>
 Prelude> :set -XRankNTypes
 Prelude> let foo :: forall a. Eq a. Int; foo = undefined

 <interactive>:3:26: error:
     Illegal symbol '.' in type
     Perhaps you intended to use RankNTypes or a similar language
     extension to enable explicit-forall syntax: forall <tvs>. <type>
 Prelude>
 }}}

 also

 {{{
 Prelude> :kind forall a. Eq a. Int

 <interactive>:1:15: error:
     Illegal symbol '.' in type
     Perhaps you intended to use RankNTypes or a similar language
     extension to enable explicit-forall syntax: forall <tvs>. <type>
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11669>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler