[Haskell-cafe] Infix instance headers

[Bas van Dijk]

Hello,

What's the reason that infix class declarations and infix constraints
are supported but infix instance heads aren't?

For example the following code from my regions package is allowed but
writing the instance header infix results in a "Malformed instance
header" error:

class (Monad pr, Monad cr) => pr `ParentOf` cr

instance Monad r => ParentOf r r

instance ( Monad cr
         , cr `TypeCast2` RegionT resource s pcr
         , pr `ParentOf` pcr
         )
         => ParentOf pr cr

regards,

Bas