[GHC] #7593: Unable to print exceptions of unicode identifiers

[GHC]

#7593: Unable to print exceptions of unicode identifiers
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Reporter:  dagit                              |          Owner:                  
    Type:  bug                                |         Status:  new             
Priority:  normal                             |      Component:  Compiler        
 Version:  7.6.1                              |       Keywords:                  
      Os:  Windows                            |   Architecture:  Unknown/Multiple
 Failure:  Incorrect warning at compile-time  |      Blockedby:                  
Blocking:                                     |        Related:                  
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 I suspect this is windows specific but I'm not certain (I couldn't
 reproduce it with an older ghc on osx).

 Here is an example of the problem:
 {{{
 $ ghcii.sh
 GHCi, version 7.6.1: http://www.haskell.org/ghc/  :? for help
 Loading package ghc-prim ... linking ... done.
 Loading package integer-gmp ... linking ... done.
 Loading package base ... linking ... done.
 Prelude λ> ⇒

 <interactive>:2:1: parse error on input `*** Exception: <stderr>:
 hPutChar: invalid argument (invalid character)
 }}}

 On other platforms the message looks more like: parse error on input `=>'

 (not the automatic translation from ⇒ to =>, I think that's a separate bug
 related to the unicode symbols extension)

 On windows my ghc is version 7.6.1. On OSX (where I could NOT reproduce
 the exception), my ghc is 7.4.1. I don't know if the GHC version matters.
 I strongly suspect this is a windows unicode issue.

 GHC gives similar behavior to ghci, for example on this input:
 {{{
 ⇒ = 1
 }}}

 ghc tries to give an error message but throws an exception printing ⇒.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7593>
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