[GHC] #15755: randomRIO panic on (GHC version 8.4.3 for x86_64-apple-darwin)

[GHC]

#15755: randomRIO panic on (GHC version 8.4.3 for x86_64-apple-darwin)
-------------------------------------+-------------------------------------
        Reporter:  cmal              |                Owner:  (none)
            Type:  bug               |               Status:  infoneeded
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:  randomRIO
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by khanage):

 I've also encountered this on macos 10.13. Here's the logs from a ghci
 session:
 {{{
 λ> :set -package random
 package flags have changed, resetting and loading new packages...
 λ> import System.Random (randomRIO)
 λ> randomRIO (10, 100)
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.4.4 for x86_64-apple-darwin):
         nameModule
   system $dShow_a12oz
   Call stack:
       CallStack (from HasCallStack):
         callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in
 ghc:Outputable
         pprPanic, called at compiler/basicTypes/Name.hs:241:3 in ghc:Name

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

 λ> r <- randomRIO (10, 100)
 λ> r
 46
 }}}

 Maybe ghci has a problem with showing unbound values?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15755#comment:2>
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