[GHC] #1579: instance Read Integer contradicts Haskell98

[GHC]

#1579: instance Read Integer contradicts Haskell98
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    Reporter:  Isaac Dupree    |        Owner:         
        Type:  bug             |       Status:  new    
    Priority:  normal          |    Milestone:         
   Component:  libraries/base  |      Version:  6.6.1  
    Severity:  normal          |   Resolution:         
    Keywords:                  |   Difficulty:  Unknown
          Os:  Unknown         |     Testcase:         
Architecture:  Unknown         |  
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Comment (by Isaac Dupree):

 (I initially discovered this while QuickCheck-ing an Integer replacement
 that defines `instance Read MyInteger where readsPrec _ = readSigned
 readDec`, against GHC's built-in Integer, and got an inconsistent result.)

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1579>
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