[GHC] #8959: GHCi should honour UnicodeSyntax

[GHC]

#8959: GHCi should honour UnicodeSyntax
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        Reporter:  Fuuzetsu          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  low               |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.6.3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by int-e):

 I'm unhappy with this change, because it uses a language extension that
 affects accepted **input** (namely, `UnicodeSyntax`) to modify the
 **output** of ghci. I would prefer having a ghci-specific option (say,
 `:set +/-u` or more verbosely, `:set +/-unicodeoutput`) instead.

 This is not just cosmetics; the current behaviour broke lambdabot's `:t`
 and `:k` commands, which parse ghci's output.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8959#comment:14>
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