Oh, I should know that. Thank you. By the way, is it only valid when "let" only affects the one expression after that? I read "where vs let" in the HaskellWiki but all the examples are "let ... in". 在 2010年 1月 17日 星期日 22:13:14，Maciej Piechotka 寫道:
On Sun, 2010-01-17 at 18:10 +0800, VoidPrayer wrote:
let ... in ...
I guess GHC is finding where "in" is.
Except that:
main = do l <- getLine let l' = lines l print l'
Is perfectly valid without in. Similary:
something = proc (x, y) -> do x' <- someArrow -< x let z = x + y + x' returnA -< z
Regards
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