This matches send non sendable but importantly also makes it clear that we are talking about something that doesn't conform to the Sendable protocol which is capitalized. rdar://151802975
DiagnosticsEditorMode
Migrate the last diagnostic to be independent of `DiagnosticEditorMode` and remove that option. rdar://133111163
You can't do this anymore: struct G<T> {} protocol P: Sendable {} extension G: P where T: P {} Fixes rdar://95695543.
