[GHC] #10284: Create a dedicated `TypeError` exception type

[GHC]

#10284: Create a dedicated `TypeError` exception type
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        Reporter:  kosmikus          |                Owner:  kanetw
            Type:  feature request   |               Status:  merge
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Core Libraries    |              Version:  7.10.1
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  typecheck/should_run/T10284
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  phab:D866
       Wiki Page:                    |
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Changes (by bgamari):

 * cc: ekmett (added)
 * status:  closed => merge


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10284#comment:13>
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