http://helvegr.livejournal.com/ ([identity profile] helvegr.livejournal.com) wrote in [personal profile] deniok 2014-04-15 07:16 am (UTC)

zip определён как
zip (a:as) (b:bs) = (a,b) : zip as bs
zip _      _      = []

Соответственно, zip [] (tail []) выдаёт пустой список, а zip (tail []) [] исключение.
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