splitAt should be strict in its first argument
The below is a slightly editted version of http://hackage.haskell.org/trac/ghc/ticket/1182
The H98 report defines splitAt by:
splitAt :: Int -> [a] -> ([a],[a])
splitAt n xs = (take n xs, drop n xs)So we would expect:
splitAt _|_ xs = (take _|_ xs, drop _|_ xs)however, both GHC and hugs have (different) implementations that are strict in 'n', that is:
split _|_ xs = _|_These cases can be distinguished with the expression:
case splitAt undefined [] of (_,_) -> ()We propose splitAt be changed to be strict in its first argument for Haskell'.
Trac metadata
| Trac field | Value |
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| Version | |
| Type | Task |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | HaskellPrime |
| Test case | |
| Differential revisions | |
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