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So, the type of `a?.b.c` is nullable, but the type of `c` is not. Everything after `a?` is just not executed if `a` is null. R=brianwilkerson@google.com Change-Id: I705051080b8cc2bb5014355688561b0f3dccc0d8 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/115660 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>