[GHC] #12708: RFC: Representation polymorphic Num

GHC ghc-devs at haskell.org
Tue Dec 13 14:55:33 UTC 2016


#12708: RFC: Representation polymorphic Num
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        Reporter:  Iceland_jack      |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Core Libraries    |              Version:  8.0.1
      Resolution:                    |             Keywords:
                                     |  LevityPolymorphism
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 goldfire):

 Replying to [comment:25 oerjan]:
 > The question is, how would you store the necessary `Int#` in the
 dictionary? It seems to me you'd have to use some kind of indirection
 because otherwise you have a dictionary field than can have arbitrary
 size.

 Spot on. You're right -- we would have a problem with `Bounded`.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12708#comment:26>
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