[GHC] #5688: instance Read Integer/Rational/Double readsPrec out of memory and crash due to exponential notation

[GHC]

#5688: instance Read Integer/Rational/Double readsPrec out of memory and crash due
to exponential notation
---------------------------------+------------------------------------------
    Reporter:  gracjan           |       Owner:  igloo           
        Type:  bug               |      Status:  patch           
    Priority:  highest           |   Milestone:  7.4.1           
   Component:  libraries/base    |     Version:  6.12.3          
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  Runtime crash   
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
---------------------------------+------------------------------------------

Comment(by maeder):

 I think, eventually we want to reject "e-Notation" for rationals "at the
 prompt" (which is harder if already fractionals are represented via
 `Exp`).

 (And the read instance for rationals should accept the decimal point
 only.)

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5688#comment:30>
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