Re: [Haskell-cafe] Fixity of >>>

On Fri, Jul 27, 2007 at 12:08:30AM +1000, Donald Bruce Stewart wrote:

There's a theory this should work:

getContents >>= lines >>> map read >>> sum >>> print

But unfortunately we have:

`(>>=)' [infixl 1] `(>>>)' [infixr 1]

Meaning we must write:

getContents >>= (lines >>> map read >>> sum >>> print)

Indeed, all Arrow ops are infixr. Are there any technical/compelling reasons for this?

Not that I can recall. But it's the precedence rather than the associativity that's bothering you here.