[Haskell-cafe] monad constraint + record update

[Eugene Kirpichov]

I think that Conal Elliot's Semantic Editor Combinators do the thing
even better: http://conal.net/blog/posts/semantic-editor-combinators/

2008/12/23 Brent Yorgey <byorgey at seas.upenn.edu>:
>>
>> Is there a standard update function for fields in data types, something
>> that OO programmers do with assignments like obj.attr := value ?
>
> Oh, I missed this question the first time.  You probably want
> Functional References:
>
> http://twan.home.fmf.nl/blog/haskell/overloading-functional-references.details
>
> -Brent
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-- 
Евгений Кирпичев
Разработчик Яндекс.Маркета