[GHC] #12540: RFC: Allow not quantifying every top-level quantifiee

[GHC]

#12540: RFC: Allow not quantifying every top-level quantifiee
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        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14245            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 I'm not sure I'd like to give up the `forall`-or-nothing rule. But note
 that there //is// a workaround here: just use extra parentheses:

 {{{#!hs
 const_ :: (forall a. a -> b -> a)
 const_ = const
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12540#comment:7>
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