A couple notes:
- regress_18535_test started failing at runtime. It's using unimplemented mirrors code, so perhaps a static failure before.
- typed_data_sublist_type_dart started failing at runtime. It was inferring Is<EfficientLength> with the type omitted. :-(
- my local chrome is newer than the one on travis failing on generators. not seeing that error.
TBR=jmesserly@google.com
Review URL: https://codereview.chromium.org/1847163002 .