[GHC] #7218: No type level distinction between BroadcastTChan and TChan

[GHC]

#7218: No type level distinction between BroadcastTChan and TChan
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 Reporter:  timthelion        |          Owner:                   
     Type:  feature request   |         Status:  new              
 Priority:  normal            |      Component:  libraries (other)
  Version:  7.4.2             |       Keywords:  STM TChan        
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple 
  Failure:  None/Unknown      |       Testcase:                   
Blockedby:                    |       Blocking:                   
  Related:                    |  
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 There is no type level distinction between BroadcastTChan(added in STM
 2.4) and TChans.  Because of this, readTChan throws a non informative
 runtime error "blocked indefinitely" when passed a broadcast chan.  Can we
 get this fixed ASAP before it gets cemented into the type system?

 Even just a more informative error message would be a huge improvement!

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7218>
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