[swift-evolution] SE-0151: Package Manager Swift Language Compatibility Version
tali at admingilde.org
Wed Feb 8 01:19:18 CST 2017
> The review of SE-0151 “Package Manager Swift Language Compatibility Version" begins now and runs through February 13, 2017. The proposal is available here:
I’ve one question regarding this proposal:
Why use the list `swiftLanguageVersions` instead of a simple `swiftLanguageVersion: Int = 3`?
What’s the advantage of being able to specify `[3,4]`?
If you already have a version 4 compiler, that one will be used anyway and if the source really is compatible with both versions,
it does not make any difference whether it will be run in version 3 or version 4 mode.
So just setting it to `3` has the same effect, right?
I think it’s enough to specify something like „this source is intended to be compiled in swift version 3 mode“.
Most of the time, that’s all you can specify anyway, because you don’t know which future versions happen to be compatible.
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