#3709: Data.Either.partitionEithers is not lazy enough
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Reporter: daniel.is.fischer | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: libraries/base | Version: 6.10.4
Resolution: fixed | Keywords:
Difficulty: | Os: Unknown/Multiple
Testcase: | Architecture: Unknown/Multiple
Failure: Runtime performance bug |
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Comment (by igloo):
This is a behavioural change, e.g.:
{{{
Main> case partitionEithers1 [Left 'a', error "Not me"] of (x : _, _) -> x
Program error: Not me
Main> case partitionEithers2 [Left 'a', error "Not me"] of (x : _, _) -> x
'a'
}}}
Shouldn't it be discussed on the libraries list first?
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3709#comment:2>
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