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Bug: https://github.com/dart-lang/language/blob/63d164fa7a507b28aace20fffe31db2c3c9baa2d/accepted/future-releases/set-literals/implementation-plan.md (Task 10) Change-Id: I9728706e235162318aec824484274aea58210e8a Reviewed-on: https://dart-review.googlesource.com/c/84600 Commit-Queue: Lasse R.H. Nielsen <lrn@google.com> Reviewed-by: Leaf Petersen <leafp@google.com> Reviewed-by: Erik Ernst <eernst@google.com>