[GHC] #13780: Nightmarish pretty-printing of equality type in GHC 8.2 error message

[GHC]

#13780: Nightmarish pretty-printing of equality type in GHC 8.2 error message
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        Reporter:  RyanGlScott       |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.2.1-rc2
  checker)                           |
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Poor/confusing    |  Unknown/Multiple
  error message                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by simonpj):

 * owner:  (none) => goldfire


Comment:

 I think this is another piece of fallout from the horrible `uo_thing`
 mess.  We are printing a `Type` in a place where we should printing a
 `HsType`.

 Richard is planning it investigate and simplify.  c.f. #13601, and
 [wiki:RichardAndSimon]

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13780#comment:2>
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