[GHC] #8541: Coercible should be higher-kinded

[GHC]

#8541: Coercible should be higher-kinded
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        Reporter:  nomeata                       |            Owner:
            Type:  task                          |  nomeata
        Priority:  normal                        |           Status:  patch
       Component:  Compiler                      |        Milestone:
      Resolution:                                |          Version:  7.6.3
Operating System:  Unknown/Multiple              |         Keywords:
 Type of failure:  None/Unknown                  |     Architecture:
       Test Case:  TcCoercible,                  |  Unknown/Multiple
  TcCoercibleFail3                               |       Difficulty:
        Blocking:                                |  Unknown
                                                 |       Blocked By:
                                                 |  Related Tickets:
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Changes (by nomeata):

 * status:  new => patch
 * testcase:   => TcCoercible, TcCoercibleFail3


Comment:

 Added a few testcases and avoiding panics for `Coercible (T NT1) (T NT2)`.

 Please break (or review) my code!

 Fancy side-by-side-diffs:
 http://git.haskell.org/ghc.git/commitdiff/refs/heads/wip/T8541?hp=851548d8d14e1dcf79867855b49519421734ede6;ds=sidebyside
 http://git.haskell.org/testsuite.git/commitdiff/refs/heads/wip/T8541?hp=18624e7ac6e391d90963500e1fecf0affc551dbf

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8541#comment:2>
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