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* ManifestFixKind, PubspecFixKind, ImportElementInfo class * WithNullSafetyMixin mixin * suggestionComparator function Change-Id: I9e332be6345b2f2b7b788bc4ae63a075a21cbe06 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/190821 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Samuel Rawlins <srawlins@google.com>