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All three product targets (app, widget, share extension) now build under
SWIFT_VERSION = 6.0 with zero errors and zero warnings. The UITests
target stays on 5.0: XCTestCase's nonisolated setUp/init overrides
conflict with the target's MainActor default isolation under 6, and test
tooling is not shipping code.
The original seven diagnostics, plus the layers Swift 6 mode surfaced
once those cleared:
- SMTPChannel is an actor. It was implicitly MainActor while running its
receive loop on a background queue, so parsedLines/lineWaiters/
receiveBuffer were declared main-actor-protected and mutated off it —
concurrent mutation while resuming a CheckedContinuation can
double-resume, which traps. The actor serialises all state; Network
callbacks hop in via Task. The start() continuation also gains an
OSAllocatedUnfairLock resume-once guard: the state handler can fire
.ready and later .failed, and resuming twice was a pre-existing trap of
the same family.
- CachedLookupResult is nonisolated (a value pair built inside actor
LookupRuntime cannot have a MainActor-bound memberwise init) with
conditional Sendable — opting out of MainActor isolation also opted out
of the implicit Sendable that globally-isolated types get.
- PortScanService.printableBanner is nonisolated: a pure transformation
called from the connection's queue.
- SweepActivityController stores the activity's Sendable id instead of
the non-Sendable Activity, re-resolving via Activity.activities inside
each fire-and-forget task, so nothing non-Sendable crosses isolation.
- App Intents' static title/description/openAppWhenRun become lets
(get-only protocol requirements; static var is shared mutable global
state), and the summary helpers are @MainActor to match the model
properties they read and the perform() implementations that call them.
- ExternalDataService's ISO8601DateFormatter is nonisolated(unsafe),
citing Apple's documented thread-safety, rather than risking a parser
behaviour change by switching APIs with no test coverage.
- TaskMetricsDelegate.metrics is nonisolated(unsafe): written on the
session's delegate queue, read only after the request completes, and
URLSession guarantees didFinishCollecting precedes task completion.
- The share extension extracts the host via async/withCheckedContinuation
instead of sending a non-Sendable completion into loadItem's @Sendable
handler; Task inherits the view controller's MainActor so the manual
DispatchQueue.main hop goes too.
Validated: clean Swift 6 build of all product targets, and the full
enforced 11-test audit suite green on the floor runtime — Swift 6's
runtime isolation checks ran the app through every screen without a
trap.
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actionable notifications
- Sweep Live Activity: SweepActivityAttributes (Shared/), lock-screen + Dynamic
Island UI in the widget extension, driven by SweepActivityController wired into
the batch pipeline (begin/update/end); NSSupportsLiveActivities in Info.plist.
- Share extension (DomainDigShareExtension): accepts a web URL from the share
sheet, extracts the host, and hands it to the app via the App Group inbox
(DomainDigShareInbox); the app consumes it on activation and inspects it.
- iPad layout: RootTabView uses NavigationSplitView in the regular size class
and the tab bar in compact.
- Actionable notifications: per-domain threadIdentifier grouping, a Re-inspect
action, and tap routing into the domain detail via the intent router.
- Bump version to 4.6.0 (build 38) across app, widget, and share targets.
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