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With these changes, I can run: ./tools/build.py -m release --nnbd dartdevc_test In a checkout that also includes a migrated core library that uses NNBD features. I haven't verified if the resulting JS is *correct*, but the build doesn't error out. Change-Id: I7d89efe5da8c46e2a9805743e4e61858da8097dd Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/122280 Reviewed-by: Nicholas Shahan <nshahan@google.com> Commit-Queue: Bob Nystrom <rnystrom@google.com>