[GHC] #13819: TypeApplications-related GHC panic

[GHC]

#13819: TypeApplications-related GHC panic
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        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler (Type    |              Version:  8.2.1-rc2
  checker)                           |             Keywords:
      Resolution:                    |  TypeApplications
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by simonpj):

 * cc: goldfire (added)


Comment:

 Richard, this is yet more fallout from the terrible `uo_thing` mess.

 The panic comes from the argument-counting in `repSplitAppTys`, when
 called from `mkTypErrorThing` or `mkTypeErrorThingArgs`.   At the moment
 we construct this `ErrorThing` the kind of the type has not been zonked,
 so we have a `FunTy t1 t2` with `t1 :: kappa`.

 I guess this will be fixed when we tidy up `uo_thing`... but that is
 looking increasingly urgent.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13819#comment:3>
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