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This for instance avoids an exponential blowup that would previously have occurred in certain cases. Change-Id: I258d8153e75f7059bca346826b5dec62cc1bac84 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/249000 Reviewed-by: Johnni Winther <johnniwinther@google.com> Reviewed-by: Joshua Litt <joshualitt@google.com> Reviewed-by: Aske Simon Christensen <askesc@google.com> Commit-Queue: Jens Johansen <jensj@google.com>