Start adoption of @section and @used.
#1450
Open
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This PR begins our migration to
@sectionand@used. Because of a bug in the Swift compiler (swiftlang/swift#85411), we still need to rely on an unsupported/experimental language feature (CompileTimeValuesPreview). When that bug is resolved, we can remove checks for CompileTimeValuesPreview and fully "activate" this new code path.This PR has the immediate effect of suppressing compile-time warnings when building Swift Testing as a package.
Note that because of that bug, this PR does not resolve 1371.
Checklist: