[swift-build-dev] [Draft] SwiftPM: Adding development package as a dependency

[Max Howell]

> 1) You have to remember to modify it back at some point, and if you are iterating frequently this is tedious and error-prone
> 
> One way I can think of to avoid Package.swift is to place DevPackages inside some special folder (perhaps: DevPackages/) inside the root package which sounds good if I am developing some patch to some package but it might be awkward if I am starting to write a library and want to create a package to try it because I'll already have created the library package (though maybe minimal) but then I'll have to move the library inside DevPackages/

Well, it seems to me part of the utility here is having a package be a local clone in an entirely different directory. So this sounds a bit tedious.

> This would be a bit awkward but sounds good enough to me
>  
> 2) We don’t want any chance that DevPackage gets into the package graph and thus the ecosystem.
> 
> what if one of the dependencies depend on a package inside DevPackage then should the DevPackage be preferred?

Don’t understand.
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