[noob] Typing error with nested list and tuple pattern?

Hi all

I am baffled by the following error message from Hugs 98 (Version May 2006):

ERROR file:.\cube.hs:11 - Type error in explicitly typed binding
*** Term           : [(i,v) : ps]
*** Type           : [[(a,b)]]
*** Does not match : [(Int,Double)]

when attempting to compile the following declaration (line numbers in
brackets):

[10] test :: [(Int, Double)] -> Int
[11] test [(i,v):ps] = i

Is this a bug? If not, how do I write the pattern properly?

Thanks,
Peter Arrenbrecht
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