[Nix-dev] Problem compiling a rust program without fetchFromGitHub

[Moritz Ulrich]

I had a similar error a few days ago and haven't bothered investigating.

Just a thought: Try removing the `target/` folder in your local folder
and/or add a `preConfigure` or similar that will remove that folder. 

Christian Kauhaus <kc at flyingcircus.io> writes:

> Am 21.03.2017 um 16:47 schrieb stewart mackenzie:
>> $ nix-garbage-collect then retry
>
> This time I'm getting a new error:
>
> | Fetching /tmp/nix-build-my-rustfmt-fetch.drv-0/rustfmt to /nix/store/7v30ck1i3c1l2j2g461ld3jaq3hvfg01-my-rustfmt-fetch
> | Using rust registry from /nix/store/gv06zlhm4rnhi7j9s1sjj4njns3ca788-rustRegistry-2017-02-19-d822c58
> | warning: custom registry support via the `registry.index` configuration is being removed, this functionality will not work in the future
> |     Updating registry `file:///nix/store/gv06zlhm4rnhi7j9s1sjj4njns3ca788-rustRegistry-2017-02-19-d822c58`
> |     Updating registry `file:///nix/store/gv06zlhm4rnhi7j9s1sjj4njns3ca788-rustRegistry-2017-02-19-d822c58`
> |     Updating registry `file:///nix/store/gv06zlhm4rnhi7j9s1sjj4njns3ca788-rustRegistry-2017-02-19-d822c58`
> |     Updating registry `file:///nix/store/gv06zlhm4rnhi7j9s1sjj4njns3ca788-rustRegistry-2017-02-19-d822c58`
> |     Updating registry `file:///nix/store/gv06zlhm4rnhi7j9s1sjj4njns3ca788-rustRegistry-2017-02-19-d822c58`
> |     Updating registry `file:///nix/store/gv06zlhm4rnhi7j9s1sjj4njns3ca788-rustRegistry-2017-02-19-d822c58`
> | error: no matching package named `syntex_syntax` found (required by `rustfmt`)
> | location searched: registry file:///nix/store/gv06zlhm4rnhi7j9s1sjj4njns3ca788-rustRegistry-2017-02-19-d822c58
> | version required: = 0.58.1
> | versions found: 0.58.0, 0.57.0, 0.56.2, ...
> | builder for ‘/nix/store/s23lbgjqvk36c0vgjxxxmg6d22n0jak8-my-rustfmt-fetch.drv’ failed with exit code 101
> | cannot build derivation ‘/nix/store/krzc387z5kcwzkyhn3g9vq557272y6na-my-rustfmt.drv’: 1 dependencies couldn't be built
>
> Looks to me that the index is out of sync which the crates snapshot. I've inspected the buildRustPackage code but did not find the place where such a problem could originate from.
>
> syntex_syntax 0.58.1 has been added to crates.io on 2017-02-19.
>
> Needless to say that the nix expression using fetchFromGitHub still works and is yielding exactly the same output as last time, regardless of nix-collect-garbage or whatnot.
>
> BR
>
> Christian
>
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