[GHC] #13772: Cannot put HasCallStack on instances

[GHC]

#13772: Cannot put HasCallStack on instances
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           Reporter:  augustss       |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 I'd like to get stack traces even when I'm using methods from a class, but
 I don't seen to be able to put HasCallStack in instance declarations.
 See attached code.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13772>
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