[GHC] #8017: Empty instance

[GHC]

#8017: Empty instance
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    Reporter:  wvv     |        Owner:            
        Type:  bug     |       Status:  closed    
    Priority:  normal  |    Component:  GHCi      
     Version:  7.6.3   |   Resolution:  duplicate 
    Keywords:          |           Os:  Windows   
Architecture:  x86     |      Failure:  GHCi crash
   Blockedby:          |     Blocking:            
     Related:          |  
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Changes (by monoidal):

  * status:  new => closed
  * resolution:  => duplicate


Comment:

 GHC is technically correct: `T1 == T1` is an infinite loop, since by
 default `(==)` is implemented via `(/=)` and `(/=)` via `(==)`, so you can
 write only one of them. Bug #7633 is about detecting this situation.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/8017#comment:1>
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