#7045: The `Read` instance of `Rational` does not support exponential notation
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Reporter: maeder | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 7.6.1
Component: libraries/base | Version: 7.4.2
Resolution: | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Difficulty: Unknown
Testcase: | Blockedby:
Blocking: | Related: #7044, #5692
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Comment(by maeder):
Maybe worse is, that the decimal point is not supported?
If (real) floating point literals would be converted only for numbers in
the class `RealFloat`, then my original issue (namely, same behavior as
literal or as read argument) would be trivially solved.
But that is a design decision (to be taken considering the related
tickets).
(My design would distinguish ints, fractionals and floats.)
If you miss "1e10" as Rational then why not as Integer? (I would leave
using "{{{^}}}" to the user.)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7045#comment:6>
GHC <http://www.haskell.org/ghc/>
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