[swift-build-dev] Proposal: Git Branch and ref support for dependencies in Swift Package Manager

[Max Howell]

> Looks good.
> 
> What about getting packages that don't have any semver tags initially?
> For eg I create a package and want to use it in a different package while also developing the original package and I did a `git init` but not `git tag v0.0.1`?

Personally my thinking for this use case has been a separate feature in Package.swift, eg (not concrete proposal):

Package(
    dependencies: [DevPackage(localPath: “../Foo”)])
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