[NFC] Fix some of the new Swift main
snapshots warnings
#7214
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Motivation:
Swift snapshots off
main
warn about@retroactive
attribute not present on retroactively added protocol conformance, i.e. when a type and a protocol it conforms to are coming from different modules.Modifications:
Added
@retroactive
attribute conditionally when built with Swift versions lower than 5.10. Also fixed a few other warnings that were introduced recently with an unusedlet
binding and an unusedComparable
conformance.Result:
Reduced number of warnings when building with Swift
main
snapshots. New concurrency warnings appearing in Swiftmain
are untouched here, as they require much more invasive changes to fixSendable
conformances.