Re: [Haskell-cafe] Infix tuple comma query (,)

Am Montag 06 April 2009 17:53:24 schrieb Paul Keir:

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?

Tuples are special baked-in syntax. The parentheses are part of the tuple constructor(s). It may be confusing you that you can use it prefix as well as "aroundfix".

Thanks,

Paul