Keep the present Haskell record system!

Lennart Augustsson lennart at
Mon Mar 6 00:34:33 EST 2006

Can it be implemented efficiently?

Cale Gibbard wrote:
> On 04/03/06, Benjamin Franksen <benjamin.franksen at> wrote:
>> On Saturday 04 March 2006 19:35, Claus Reinke wrote:
>>> my current favourite for such a simple alternative record system
>>> would be Daan Leijen's "Extensible records with scoped labels"
>>> (TFP2005):
>> Yes. Daan Leijen's record system is the best of all the ones I have read
>> about, not least because of its simplicity.
> I just looked at this, and it made me wonder why we all haven't jumped
> on it. It looks pretty much ideal -- are there any known problems with
> it? It has pretty much all the operations that you'd want in an
> extensible record system, there are no lacks predicates to worry
> about, type inference is complete and sound (and there are
> constructive proofs available of this), and it doesn't look like it
> should be all that difficult to implement (the paper even gives
> suggestions as to possible efficient implementations). What are we
> searching for?
>  - Cale
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