Re: [Haskell] Proposal: Allow "\=" for field update in record update syntax

robert dockins wrote:

Is that really how this is done? That doesn't seem like it can be right:

instance X (a b) -- single parameter class where 'a' has an arrow kind

is very different from:

instance X a b -- multiple parameter class

I would expect a type constructed with 'appT' to correspond to the first declaration, and not to the second.

Yup, thats how it is done, I have some complex working TH that generates multi parameter classes with fundeps instances etc... and I can say for definite it all works fine: For the above examples appT X (appT a b) -- X is applied once (to a applied to b) appT (appT X a) b -- X is applied twice first to a then to b Keean.