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Strictness of span and break does not match documentation

    • Open Issue created by rwbarton @trac-rwbarton

    The documentation of span says

    span p xs is equivalent to (takeWhile p xs, dropWhile p xs)

    However, that's not literally true since span p xs is | if either xs is | or xs = x :_ and p x is |.

    This same error is also present in the Haskell 98 report, which states the same property of span but gives a definition equivalent to the one used by GHC.

    Trac metadata
    Trac field Value
    Version 8.0.1
    Type Bug
    TypeOfFailure OtherFailure
    Priority normal
    Resolution Unresolved
    Component libraries/base
    Test case
    Differential revisions
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    Operating system
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