patch applied (haskell-prime-status): add ""Make $ left associative, like application"

[apfelmus]

Cale Gibbard wrote:
> apfelmus wrote:
>>
>> Unfortunately, the identity functor currently can't be overloaded,
>> although I think it would be unambiguous.
>>
> 
> Unfortunately, it would be quite ambiguous -- the identity functor
> overlaps with basically any other. Consider the case:
> 
>     reverse . [[1,2,3],[4,5]]
> 
> which if (.) is fmap would normally mean [[3,2,1],[5,4]], but if the
> identity functor is used instead would mean [[4,5],[1,2,3]].

Whoops, what I did think here? I somehow thought that the argument of 
the function applied ( reverse  in this case) would fix the functor. But 
this only works if the function is monomorphic:

   (reverse :: [[Int]] -> [[Int]]) .  [[1,2,3],[4,5]]
   (reverse :: [Int] -> [Int]) .  [[1,2,3],[4,5]]

not if it's polymorphic.


Regards,
apfelmus