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It will take some time until the CFE will take on reporting this error (and duplicate keys in maps). For now: detect whether a map is used as the implementation of a set literal, and if so report the error differently. Change-Id: I9f657189c79a4532023f615aa91bf63602f27664 Reviewed-on: https://dart-review.googlesource.com/c/91102 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Sigmund Cherem <sigmund@google.com>