[Nix-dev] An issue regarding the default parameters of a function

[Vladimír Čunát]

Hi.

On 02/12/2016 12:11 PM, Sergey Mironov wrote:
> I have an issue regarding the combination of two Nix features:
> default parameters ( f = {arg ? def } : ...) and arbitrary length
> parameters (f = args@{arg, ...} : ...).

@-pattern binds exactly what was *passed* to the function. Eelco
considers that a feature IIRC. There's been a discussion about this on a
couple of nix issues on github.

Personally, I would prefer to bind the attrmap after substituting
defaults, as that seems much more useful, but that would be a
non-compatible change to nix...

--Vladimir


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