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Ryan Yates | 23 Apr 2012 22:54
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Re: The last statement in a 'do' construct must be an expression: a <- readArray arr (1, 1)

Perhaps you are mixing tabs and spaces?

On Mon, Apr 23, 2012 at 4:52 PM, KC <kc1956 <at> gmail.com> wrote:
I'm getting the above error message and I cannot figure out why?


buildPair =
    do
arr <- newArray ((1,1),(1,10)) 37 :: ST s (STArray s (Int,Int) Int)
a <- readArray arr (1,1)
        writeArray arr (1,1) 64
        b <- readArray arr (1,1)
        return (a,b)


main = print $ runST buildPair


--
--
Regards,
KC

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