[GHC] #13838: -Wdeferred-type-errors on a program with main not of type IO () yields "main thread exited (uncaught exception)"

[GHC]

#13838: -Wdeferred-type-errors on a program with main not of type IO () yields
"main thread exited (uncaught exception)"
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        Reporter:  harry             |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13292            |  Differential Rev(s):  Phab:D4708
       Wiki Page:                    |
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Changes (by sighingnow):

 * status:  new => patch
 * differential:   => Phab:D4708


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13838#comment:5>
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