[Nix-dev] concatAttrs :: [attrSet] -> attrSet ?

[Sergiu Ivanov]

Hello Daniel,

Thus quoth  Daniel Peebles  at 13:58 on Tue, May 30 2017:
>
> My favorite interface for this type of operation is from Haskell's
> Data.Map, in pseudo-Haskell notation:
>
> unionWithKey : (String -> a -> a -> a) -> Attrs a -> Atrs a -> Attrs a

Right, that's exactly the kind of function I was looking for :-)

Now, I think that in Nix the main problem is that attribute sets are
very often nested and that generic functions should be capable of
handling this nesting.  On the other hand, you usually don't care about
nesting when using Data.Map.

--
Sergiu
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