[Haskell-cafe] Class-like features for explicit arguments

Ertugrul Söylemez ertesx at gmx.de
Sun Apr 26 03:37:59 UTC 2015

> Ok cool. Sounds like we agree.
> Luite and I talked about something similar a few months ago, I'll try
> to dig up my notes and maybe we can turn this into a ghc feature
> request or patch

Great, I would definitely help with that!

>> > are you sure you've evaluated how it interacts with this sort of
>> > optimization? I think it actually gets you pretty far!
>> Most of the magic occurs in reification.  The trouble is that it expects
>> a polymorphic function of rank 2 with a nontrivial context (Reifies), a
>> function that by construction cannot be specialised, unless you
>> specialise the receiving function (reify) for every application case.
>> The beauty of reflection is that it's free by virtue of sharing.
>> Unfortunately sharing is the exact opposite of inlining.
>> According to a benchmark I've done a few months ago it behaves exactly
>> as if the reflected value was just a shared argument with no inlining
>> performed; an expected and reasonable result.
>> What I'm really after is a sort of controlled inlining.  That's pretty
>> much what instance-based specialisation currently does for dictionaries.
>> Technically a dictionary is just another argument, so there is no
>> fundamental reason why we shouldn't have a more general specialiser.
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