#5688: instance Read Integer/Rational/Double readsPrec out of memory and crash
due
to exponential notation
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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: |
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Comment(by gracjan):
I've created separate ticket for report change and source code compile:
http://hackage.haskell.org/trac/ghc/ticket/5692
Also to document 6.12.3 behavior:
{{{
GHCi, version 6.12.3: http://www.haskell.org/ghc/
Prelude> read "123e10" :: Integer
1230000000000
Prelude> read "123e10" :: Double
1.23e12
Prelude> read "123e10" :: Rational
*** Exception: Prelude.read: no parse
Prelude> 123e10 :: Integer
<interactive>:1:0:
No instance for (Fractional Integer)
arising from the literal `1.23e12' at <interactive>:1:0-5
Possible fix: add an instance declaration for (Fractional Integer)
In the expression: 1.23e12 :: Integer
In the definition of `it': it = 1.23e12 :: Integer
Prelude> 123e10 :: Double
1.23e12
Prelude> 123e10 :: Rational
1230000000000 % 1
}}}
So source code compile of Integer and Rational is not compatible with Read
instances.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5688#comment:17>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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