[GHC] #14925: Non-ASCII type names get garbled when their `TypeRep` is shown

[GHC]

#14925: Non-ASCII type names get garbled when their `TypeRep` is shown
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           Reporter:                 |             Owner:  (none)
  leftaroundabout                    |
               Type:  bug            |            Status:  new
           Priority:  low            |         Milestone:
          Component:                 |           Version:  8.2.1
  libraries/base                     |
           Keywords:  Typeable       |  Operating System:  Unknown/Multiple
  TypeRep Unicode ASCII UTF-8        |
       Architecture:                 |   Type of failure:  Incorrect result
  Unknown/Multiple                   |  at runtime
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 [http://hackage.haskell.org/package/base-4.10.1.0/docs/Data-Typeable.html
 Typeable] allows easily showing the name of a type by, well, using `show`
 on it. However, this does not work right for types with Unicode symbols in
 their name:
 {{{
 GHCi, version 8.2.1: http://www.haskell.org/ghc/  :? for help
 Prelude> :m +Data.Typeable
 Prelude Data.Typeable> data W = W
 Prelude Data.Typeable> typeOf W
 W
 Prelude Data.Typeable> data Ω = Ω
 Prelude Data.Typeable> typeOf Ω
 Ω
 }}}
 This did not yet happen in GHC-7:
 {{{
 GHCi, version 7.10.2: http://www.haskell.org/ghc/  :? for help
 Prelude> :m +Data.Typeable
 Prelude Data.Typeable> data W = W
 Prelude Data.Typeable> typeOf W
 W
 Prelude Data.Typeable> data Ω = Ω
 Prelude Data.Typeable> typeOf Ω
 Ω
 }}}
 N.b.:
 {{{
 Prelude> import Data.ByteString.Char8 as BC8
 Prelude BC8> BC8.putStrLn $ pack "Ω"
 Ω
 }}}
 So, this appears to be a UTF-8 problem – something interprets bytestring-
 stored type-representation names as a different character encoding.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14925>
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