[GHC] #13640: Core lint error with deferred type holes

[GHC]

#13640: Core lint error with deferred type holes
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           Reporter:  Iceland_jack   |             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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 {{{#!hs
 {-# Options_GHC -dcore-lint -fdefer-typed-holes #-}

 import Prelude hiding ((.))

 class Functor' f where
   map' :: (a -> b) -> f a -> f b

 class Bifunctor' f where
   map2' :: (a -> b) -> f a c -> f b c

 bimap' :: Bifunctor' f => (a -> b) -> (c -> d) -> (f a c -> f b d)
 bimap' f g = map2' f . map'
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13640>
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