[GHC] #12158: ghc: panic! (the 'impossible' happened) translateConPatVec: lookup

[GHC]

#12158: ghc: panic! (the 'impossible' happened)  translateConPatVec: lookup
-------------------------------------+-------------------------------------
        Reporter:  wozgonon          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by wozgonon):

 Actually, one can reproduce with just two lines:

 {{{
 GHCi, version 8.0.1: http://www.haskell.org/ghc/  :? for help
 Prelude> data Stock = Stock {name :: String, ric :: String, price ::
 Float} deriving (Show)
 Prelude> price Stock{name=name,ric=ric,price=price} = price
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.0.1 for x86_64-unknown-mingw32):
         translateConPatVec: lookup

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

 Prelude>
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12158#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler