[GHC] #8273: ghc: panic! (the 'impossible' happened)

[GHC]

#8273: ghc: panic! (the 'impossible' happened)
-------------------------------------------------+-------------------------
        Reporter:  ready2go                      |            Owner:
            Type:  bug                           |           Status:  new
        Priority:  normal                        |        Milestone:
       Component:  Compiler                      |          Version:  7.4.1
      Resolution:                                |         Keywords:
Operating System:  Unknown/Multiple              |     Architecture:
 Type of failure:  None/Unknown                  |  x86_64 (amd64)
       Test Case:  Prelude>  data Shape =        |       Difficulty:
  Circle Float Float Float | Rectangle Float     |  Unknown
  Float Float Float deriving (show)              |       Blocked By:
        Blocking:                                |  Related Tickets:
-------------------------------------------------+-------------------------

Comment (by ready2go):

 The problem is triggered by my typing 'show' with a lower-case 'S' by
 newbie mistake in 'deriving(Show)'

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8273#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler