[GHC] #10493: Inaccessible code might be accessible with newtypes and Coercible

[GHC]

#10493: Inaccessible code might be accessible with newtypes and Coercible
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        Reporter:  goldfire          |                   Owner:  goldfire
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       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:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by Richard Eisenberg <eir@…>):

 In [changeset:"ace8d4fcfd798b70c34e325c562878b0a8f5e2cb/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="ace8d4fcfd798b70c34e325c562878b0a8f5e2cb"
 Fix #10493.

 Now, a Coercible (T1 ...) (T2 ...) constraint is insoluble only
 when both T1 and T2 say "yes" to isDistinctTyCon. Several comments
 also updated in this patch.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10493#comment:5>
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