#4282: Data.List.intersperse not lazy enough
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Reporter: daniel.is.fischer | Owner:
Type: proposal | Status: new
Priority: normal | Component: libraries/base
Version: 6.12.3 | Keywords: intersperse, laziness
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Other
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Comment(by maeder):
Does the following implementation gain something?
{{{
intersperse :: a -> [a] -> [a]
intersperse s l = case l of
[] -> l
x : r -> x : case r of
[] -> r
_ -> s : intersperse s r
}}}
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4282#comment:2>
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