Remove @testable imports WIP

[MaxDesiatov]

[One line description of your change]

Motivation:

[Explain here the context, and why you're making that change. What is the problem you're trying to solve.]

Modifications:

[Describe the modifications you've done.]

Result:

[After your change, what will change.]

[MaxDesiatov]

@swift-ci test

[MaxDesiatov]

@swift-ci test

[MaxDesiatov]

@swift-ci test

[MaxDesiatov]

@swift-ci test

[MaxDesiatov]

@swift-ci test

[MaxDesiatov]

@swift-ci test windows

[rauhul]

Sorry for the negative feedback, but this seems like a really bad idea. it opens all of these APIs to be used by anything in package for the (imo small) benefit of avoiding @testable. instead please consider @_spi(Test) or something similar like swift-driver does. It's a lot more clear at the declaration site why the API is public than package.

[MaxDesiatov]

This PR is a draft WIP and isn't ready for feedback.

I'm only trying it out to see if this enables incremental builds for bootstrap builds at all via any changes in code, which may not be the case in the end. At that point we won't care if @_spi is better (IMO it isn't because of its excess verbosity and lack of support in tooling like auto-completion) than package if neither solve the actual problem.

[MaxDesiatov]

@swift-ci test linux

[MaxDesiatov]

@swift-ci test

[MaxDesiatov]

@swift-ci test

[MaxDesiatov]

@swift-ci test windows