[Haskell-beginners] Why does this list comprehension return an empty list?

[Kim-Ee Yeoh]

On Wed, Jul 24, 2013 at 7:47 AM, Kim-Ee Yeoh <ky3 at atamo.com> wrote:

> Try:  [(a,b) | a <- f xs | b <- g xs]
>

Oops, that'll only work if you define g xs = [[]], not []. So yes, you've
basically got a zip.

-- Kim-Ee
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