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This change is a follow-up to https://dart-review.googlesource.com/c/sdk/+/250222. TEST=language/async/await_user_defined_future_soundness_test Issue: https://github.com/dart-lang/sdk/issues/49345 Change-Id: I9e486a0a90fbe6df74398bd11a2be805e6d1c0a4 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/250404 Reviewed-by: Lasse Nielsen <lrn@google.com> Auto-Submit: Alexander Markov <alexmarkov@google.com> Commit-Queue: Lasse Nielsen <lrn@google.com>