#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: |
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Comment(by maeder):
I'm not happy, too. Representing all fractionals via `Exp` has some
drawbacks. What does your patched `q` give for "420.00000"?
{{{
Prelude> 4.2000000 * 10 ** 2
420.0
Prelude> 42000000 * 10 ** (-5)
420.00000000000006
}}}
I more liked Daniel's proposal: replacing the `Rat Rational` constructor
with e.g. `RatExp Rational (Maybe Integer)`.
Another point is, how such a literal is displayed in error messages by the
patched ghc?
{{{
Prelude> 10.0 :: Integer
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5688#comment:29>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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