[GHC] #10542: Incorrect Unicode input on Windows Console

[GHC]

#10542: Incorrect Unicode input on Windows Console
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              Reporter:  ptroev      |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  high        |         Milestone:
             Component:  Compiler    |           Version:  7.8.3
              Keywords:  windows     |  Operating System:  Windows
  stdin utf-8 cmd chcp 65001         |   Type of failure:  Incorrect result
  getLine                            |  at runtime
          Architecture:              |        Blocked By:
  Unknown/Multiple                   |   Related Tickets:  4471
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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 To reproduce:
 - start a windows console
 - change the console's font to a ttf unicode font, like "Lucida Console".
 - type "chcp 65001" to set it to the UTF-8 code page.
 - start ghci (same error appears when running compiled executable)
 - > import System.IO (or GHC.IO.Handle)
 - > enc <- mkTextEncoding "UTF8"
 - > hSetEncoding stdin enc
 - > getLine
 - > Фывфыв (or any international unicode sequence)
 *** Exception: <stdin>: hGetLine: end of file

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10542>
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