[GHC] #11456: Type application and :set +c command cause panic

[GHC]

#11456: Type application and :set +c command cause panic
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        Reporter:  Iceland_jack      |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  8.1
      Resolution:  fixed             |             Keywords:
                                     |  TypeApplications GHCi
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  ghci/scripts/T11456
      Blocked By:                    |             Blocking:
 Related Tickets:  #11329            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Iceland_jack):

 Error2.hs fails, seems like same problem and can be added to the test
 suite:

 {{{
 $ ghci -ignore-dot-ghci
 GHCi, version 8.1.20160117: http://www.haskell.org/ghc/  :? for help
 Prelude> :set +c
 Prelude> :load /tmp/Error2.hs
 [1 of 1] Compiling Main             ( /tmp/Error2.hs, interpreted )
 Ok, modules loaded: Main.
 Collecting type info for 1 module(s) ...
 Error while getting type info from Main: ghc: panic! (the 'impossible'
 happened)
   (GHC version 8.1.20160117 for x86_64-unknown-linux):
         dsExpr:HsTypeOut

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

 *Main>
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11456#comment:10>
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