[GHC] #4259: Relax restrictions on type family instance overlap

[GHC]

#4259: Relax restrictions on type family instance overlap
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    Reporter:  lilac                    |       Owner:                  
        Type:  feature request          |      Status:  new             
    Priority:  normal                   |   Milestone:  7.8.1           
   Component:  Compiler (Type checker)  |     Version:  6.12.1          
    Keywords:                           |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple         |     Failure:  None/Unknown    
  Difficulty:  Unknown                  |    Testcase:                  
   Blockedby:                           |    Blocking:                  
     Related:                           |  
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Comment(by carter):

 well said,
 I have some thoughts on this. or at least my naive interpretation of a
 possible unifying point in the design space.

 I'll add a note on it to this ticket once i've thought about it a bit more

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4259#comment:28>
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