345b437179
With sound null safety, implicit "return null" at the end of function should be taken into account only if return type is nullable. TEST=pkg/vm/testcases/transformations/type_flow/transformer/regress_flutter148617.dart Issue: https://github.com/flutter/flutter/issues/148617 Change-Id: I209fc9a3b10639fd4024d4b1807591498349e1f0 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/367980 Reviewed-by: Martin Kustermann <kustermann@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>