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Fix In Review for 2019.3
[iOS] `Swift Language Version` is not set in Xcode Build Settings when a .swift source plugin is added to an Unity Project
1. Add a valid .swift source file to your Unity project and mark it as an iOS plugin.
2. Export and Xcode project and build it.
3. Observe that Xcode fails with:
The target "Unity-iPhone" contains source code developed with Swift 3.x. This version of Xcode does not support building or migrating Swift 3.x targets.
(or something similar)
This happens because we don't set the "Swift Language Version" (SWIFT_VERSION)" field to any Swift version in our build post-processor.
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