[GHC] #12445: showSDocUnsafe generate GHC panic

[GHC]

#12445: showSDocUnsafe generate GHC panic
-------------------------------------+-------------------------------------
           Reporter:  Bet            |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  ⊥
          Component:  GHC API        |           Version:  7.10.3
           Keywords:  GHC panic      |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Runtime crash
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 Try in ghci:

 {{{#!hs
 :set -package ghc
 :m Outputable
 let x = text "SomeDoc"
 showSDocUnsafe x
 }}}

 The code abobe generate:

 "ghc.exe: panic! (the 'impossible' happened)
   (GHC version 7.10.3 for x86_64-unknown-mingw32):
         v_unsafeGlobalDynFlags: not initialised

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

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12445>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler