[swift-evolution] Submodules (was: A Problem With SE-0025?)

Jordan Rose jordan_rose at apple.com
Wed Jun 22 12:59:45 CDT 2016

> I would really like to see submodules, but I think there would still be valid uses for `fileprivate` even with them.  But of course we would need to know the details of submodules to have a good discussion about that so it’s a topic for the future. :)
> I wonder what became of this: https://github.com/apple/swift/blob/master/docs/Modules.rst#id18 <https://github.com/apple/swift/blob/master/docs/Modules.rst#id18>
As the author of that document, it became clear (or maybe “it became murky”) that everyone wants different things from submodules, both for compiling their own targets and for importing other people’s targets. I’d almost suggest avoiding the word if you want to propose any of myriad features related to them:

- importing a subset of APIs
- having APIs not imported by default with the top-level module
- C++ namespacing within a module
- C++ namespacing within another module
- breaking up compilation units (i.e. not compiling the entire module as one unit)
- adding another access level between internal and fileprivate.
- adding another access level between fileprivate and private.
- something else?

(still catching up on the main thread, but I think Robert and Matthew are both right: we need to explicitly amend the proposal, and the behavior we want is fairly obvious)

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