This also adds a fix for a bug found by the tests. There are a couple of
failing tests, but they're failing because the support required for them
hasn't been implemented yet, not because of a bug.
Change-Id: Ia24dffc02aac0c4b61c9c7d8e2d744211f5b4bea
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/168401
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Phil Quitslund <pquitslund@google.com>
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
Brian Wilkerson
691d07575b