Language test for unnamed-libraries
Language test for unnamed-libraries

Bug: https://github.com/dart-lang/language/issues/1073
Change-Id: I9d57c86c35b5712029c610197e6ad823d34c492e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/262580
Commit-Queue: Samuel Rawlins <5cf2cac5eec2ad6d0eb2b0f4ff6af9a590ce2bf6@google.com>
Reviewed-by: Erik Ernst <251bb01623bfda2cd9151e339a6e783ca432874c@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk