Re: [Haskell-beginners] [Haskell-cafe] The last statement in a 'do' construct must be an expression: a <- readArray arr (1, 1)

Thank you, that was it. I was mixing up and tabs and spaces. I expected new versions of NotePad++ to keep my old settings. On Mon, Apr 23, 2012 at 1:54 PM, Ryan Yates wrote:

Perhaps you are mixing tabs and spaces?

On Mon, Apr 23, 2012 at 4:52 PM, KC 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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-- -- Regards, KC