[GHC] #10623: Handling of ASCII encodings introduced in D898 breaks Unicode terminal detection

[GHC]

#10623: Handling of ASCII encodings introduced in D898 breaks Unicode terminal
detection
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:  7.10.2
       Component:  Compiler          |                 Version:  7.10.2-rc2
      Resolution:                    |                Keywords:
Operating System:  Windows           |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:  T8958a
      Blocked By:                    |                Blocking:
 Related Tickets:  #10298, #7695     |  Differential Revisions:
                                     |  Phab:D1059, Phab:D1085
-------------------------------------+-------------------------------------
Changes (by thomie):

 * status:  closed => new
 * resolution:  fixed =>
 * os:  Unknown/Multiple => Windows


Comment:

 The test `encoding005` is failing on Windows with an unknown ASCII
 encoding error.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10623#comment:9>
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