Singleton list confusion

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Revision as of 07:07, 11 April 2008 by Lemming (talk | contribs) (link to list notation)

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Why do Haskell newcomers frequently believe, that list variables must be enclosed in brackets? People sometimes write argument patterns like [x], hoping that x will assume all values of a list successively. Maybe they expect some kind of list comprehension. However, if there wouldn't be a special list notation and if there wouldn't be the special syntax for the list type constructor (thus we must write [a] instead of List a), then there would be certainly less confusion.

See for example Haskell-Cafe about testing for same characters in lists of strings, Pattern match failure