#5688: instance Read Integer/Rational/Double readsPrec out of memory and crash 
due
to exponential notation
-------------------------------+--------------------------------------------
  Reporter:  gracjan           |          Owner:  igloo           
      Type:  bug               |         Status:  new             
  Priority:  highest           |      Milestone:  7.4.2           
 Component:  libraries/base    |        Version:  6.12.3          
Resolution:                    |       Keywords:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
   Failure:  Runtime crash     |     Difficulty:  Unknown         
  Testcase:                    |      Blockedby:                  
  Blocking:                    |        Related:                  
-------------------------------+--------------------------------------------

Comment(by igloo):

 ruby does seem to have a limit, although I'm not quite sure what it
 corresponds to:
 {{{
 $ ruby -e 'puts Float( "0." + "0"*20321 + "1e20321" )'
 9.88131291682493e-324
 $ ruby -e 'puts Float( "0." + "0"*20322 + "1e20322" )'
 -e:1: warning: Float 0.000000000000000000... out of range
 0.0
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5688#comment:48>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler

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