9803ffef27
the types phase. Also seales the Code types hierarchy to block users from attempting to create their own subclasses. Bug: https://github.com/dart-lang/language/issues/3211 Change-Id: I51ebdfdad6e1fba3c19ef91f25e238730e98e740 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/314821 Auto-Submit: Jake Macdonald <jakemac@google.com> Reviewed-by: Bob Nystrom <rnystrom@google.com> Commit-Queue: Jake Macdonald <jakemac@google.com>