[GHC] #10134: Pattern Matching Causes Infinite Type Error

[GHC]

#10134: Pattern Matching Causes Infinite Type Error
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        Reporter:  dongen            |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.8.4
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by dongen):

 Hi Simon,

 You must build this with _clash_, which is built on top of ghc.

 I tried to simplified the example but I couldn't. Still I learnt
 something.

        * I removed the need for @CLaSH.Prelude@ and copied a definition
          for @Vec@ into the @Dummy@ module. I then imported @GHC.TypeLits@
          and added lots of pragmas suggested by ghc. After that the module
          compiled fine.
        * I then did a bit more inverstigating and found that if I add
          the pragma @{-# LANGUAGE TypeFamilies #-}@ to the original
          @Dummy@ module (the one that depends on @CLaSH.Prelude@) solves
          the problem.

 Regards,


 Marc

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10134#comment:9>
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