[GHC] #12441: Conflicting definitions error does not print explicit quantifiers when necessary

[GHC]

#12441: Conflicting definitions error does not print explicit quantifiers when
necessary
-------------------------------------+-------------------------------------
        Reporter:  ezyang            |                Owner:  philderbeast
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.1
  checker)                           |
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2734
       Wiki Page:                    |
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Comment (by philderbeast):

 Found these failures ...

 {{{
 Unexpected results from:
 TEST="T3468 tcfail072 T8119 KindInvariant"
 }}}

 Of those, only T3468 is showing forall in the diff ...

 {{{
 Actual stderr output differs from expected:
      and its hs-boot file
      Main module: type role Tool phantom
                   data Tool d where
 -                   F :: a -> Tool d
 +  F :: forall d a r. a -> Tool d
      Boot file:   abstract Tool
      The types have different kinds
 *** unexpected failure for T3468(normal)
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12441#comment:5>
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