[GHC] #10495: Poor error message for Coercible constraint unsatisfiability (was: Total inability to infer type for coerce)

[GHC]

#10495: Poor error message for Coercible constraint unsatisfiability
-------------------------------------+-------------------------------------
        Reporter:  goldfire          |                   Owner:  goldfire
            Type:  bug               |                  Status:  merge
        Priority:  normal            |               Milestone:  7.10.3
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |  typecheck/should_fail/T10495
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by goldfire):

 * status:  new => merge
 * testcase:   => typecheck/should_fail/T10495
 * milestone:   => 7.10.3


Comment:

 Merge (into 7.10.3) if convenient. This is just about error messages, so
 not very important.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10495#comment:4>
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