[GHC] #10806: Type error and type level (<=) together cause GHC to hang

[GHC]

#10806: Type error and type level (<=) together cause GHC to hang
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        Reporter:  htebalaka         |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler (Type    |                 Version:  7.10.2
  checker)                           |
      Resolution:                    |                Keywords:
Operating System:  MacOS X           |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by htebalaka):

 Just to be clear, function definitions with the wrong arity still needed
 {{{triggersLoop (Q _ _) (Q _ _) = undefined}}} to trigger the issue.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10806#comment:4>
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