[GHC] #13783: 更合理的instance Monad []

[GHC]

#13783: 更合理的instance Monad []
-------------------------------------+-------------------------------------
           Reporter:  zaoqi          |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Core           |           Version:  8.0.1
  Libraries                          |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Incorrect result
  Unknown/Multiple                   |  at runtime
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 使
 {{{#!hs
 join $ map (\y->map (\x->(x,y)) [1..]) [1..]
 }}}
 的结果更合理：
 https://github.com/zaoqi/zaoqilc/blob/master/featuring/MonadList.hs

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13783>
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