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We need it to know if names in the syntactic scope will shadow the requested name if unprefixed import is used. R=brianwilkerson@google.com Change-Id: I1fd28add9241b27795160c4705a80e0f8aa6c647 Reviewed-on: https://dart-review.googlesource.com/c/92022 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>