[GHC] #11052: Standalone derived Typeable instance for promoted lists is not found

[GHC]

#11052: Standalone derived Typeable instance for promoted lists is not found
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        Reporter:  liamoc            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.0.1
       Component:  Compiler (Type    |              Version:  7.10.2
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by goldfire):

 * priority:  normal => high
 * milestone:   => 8.0.1


Comment:

 (Written concurrently with comment:2)

 This is actually expected behavior, but perhaps shouldn't be.

 The problem is that, at your call sites of `typeRep`, GHC doesn't know
 what ''kinds'' you want to specialize `'[]` and `'(:)` to. We can't have
 type representations of poly-kinded things (for various good reasons that
 would take a bit of academic research to sort out), so compilation fails.

 But we sure can improve the error message.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11052#comment:3>
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