[GHC] #9996: Support symbols in GHCi tab completion

[GHC]

#9996: Support symbols in GHCi tab completion
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              Reporter:  shachaf     |             Owner:
                  Type:  feature     |            Status:  new
  request                            |         Milestone:
              Priority:  normal      |           Version:  7.8.4
             Component:  GHCi        |  Operating System:  Unknown/Multiple
              Keywords:              |   Type of failure:  None/Unknown
          Architecture:              |        Blocked By:
  Unknown/Multiple                   |   Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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 Right now, when typing e.g. `>` followed by two tabs, GHCi shows every
 name in scope rather than just names beginning with `>`. It even lists
 operators as possible completions, but ignores it when you type the
 beginning of an operator's name. It would be better if it could actually
 complete every option it shows as a possible completion.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9996>
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