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TEST=pkg/vm/testcases/transformations/type_flow/transformer/dynamic_module_extendable.dart Change-Id: I6ef43053d86b1a12259f1cb4d0b542c9519591f8 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/370143 Reviewed-by: Slava Egorov <vegorov@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>