[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:                  
        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 gracjan):

 maeder, I do not understand your question. Lex.Lexeme is used to parse
 Integer, Float and Double only. Rationals are parsed as three lexemes:
 'Int' '%' 'Int'. They are in completely different place.

 Where do you need the conversion?

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5688#comment:13>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler