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

[Ankit Agarwal]

> This was more or less what I’ve been thinking, but lately I’ve been also
> thinking it would be great if:
>
> You didn’t have to modify Package.swift to get this feature.
>
> Because:
>
> 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/

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?
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