[GHC] #12409: Unboxed tuples have no type representations

[GHC]

#12409: Unboxed tuples have no type representations
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           Reporter:  bgamari        |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.0.2
          Component:  Compiler       |           Version:  8.0.1
           Keywords:  typeable       |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 This ticket continues with the long tradition of types missing type
 representations (see #12082, #12132, #11120). This time the culprit is
 unboxed tuples,
 {{{
 $ ghci
 GHCi, version 8.0.1: http://www.haskell.org/ghc/  :? for help
 Loaded GHCi configuration from /home/ben/.ghci
 λ> import Data.Typeable
 λ> :set -XUnboxedTuples
 λ> typeRep (Proxy :: Proxy (#Int, Int#))
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.0.1 for x86_64-unknown-linux):
         tyConRep (#,#)

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

 The problem, as usual, is that the tycons are missing from
 `knownKeyNames`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12409>
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