[Haskell-cafe] Why isn't pattern matching lazy by default?
miguelimo38 at yandex.ru
Wed Sep 19 11:33:50 EDT 2007
>> Now why isn't pattern matching lazy by default? This seems odd
>> for a newbie since everything else is lazy by default.
> It's even more confusing that pattern matching in 'let' _is_ lazy.
No, it's not.
See, in let or where constructs you don't have a choice; you can't do
different things depending on whether some value is Just x or
Nothing. Therefore, there is no need to perform pattern matching
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