#1920: Show instance for Ratio is wrong
----------------------------+-----------------------------------------------
Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: libraries/base | Version: 6.6.1
Severity: normal | Keywords:
Testcase: | Architecture: Unknown
Os: Unknown |
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GHCi> :m Data.Ratio
GHCi> show (1%2)
"1%2"
Hugs> :l Data.Ratio
Hugs> show (1%2)
"1 % 2"
The Haskell report specifies (http://haskell.org/onlinereport/ratio.html):
instance (Integral a) => Show (Ratio a) where
showsPrec p (x:%y) = showParen (p > ratPrec)
(showsPrec (ratPrec+1) x .
showString " % " .
showsPrec (ratPrec+1) y)
This effects the nofib suite, where the expected.stdout files are based on
GHC's incorrect Ratio implementation.
Tested only on 6.6.1.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1920>
GHC <http://www.haskell.org/ghc/>
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