On Mon, Apr 6, 2009 at 8:53 AM, Paul Keir <pk...@dcs.gla.ac.uk> wrote: > module Main where > > > > data (:%^&) a b = a :%^& b deriving (Show) > > > > main = do > > print $ 18 :%^& (Just 99) > > print $ (,) 9 10 > > print $ 9 , 10 > > > > The last line in the code above causes a compile error. > > Why does infix use of the comma (tuple constructor?) function fail without > brackets? > > > > Thanks, > > Paul >
When I want a lighter syntax for pairs (when doing a long list of them, e.g.), I often define (&) :: a -> b -> (a,b) a & b = (a,b) and then you can indeed write print $ 1 & 2 (assuming you get precedence right). Alex _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe