[GHC] #14061: reflection

[GHC]

#14061: reflection
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        Reporter:  zaoqi             |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by zaoqi):

 Replying to [comment:9 AntC]:
 > Replying to [comment:8 zaoqi]:
 > > 我需要能判断是否有`instance Eq a`，在运行时。
 >
 > > Google translate: I need to be able to judge whether there is
 `instance Eq a` at run time
 >
 > No: '''You''' must explain why you refuse to change the definition of
 `Dyn`.
 >
 > Google translate: 否：你必須解釋為什麼你拒絕改變 `Dyn` 的定義。
 instance Show Dyn

 instance Enum Dyn

 instance Num Dyn

 ......

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14061#comment:10>
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