This test is intended to test that:
- Prior to the release of NNBD (i.e. with the experiment flag off),
`late` and `required` continue to be usable as identifiers.
- After the release of NNBD (i.e. with the experiment flag on), `late`
and `required` are usable as identifiers in opted-out code.
Hence it doesn't belong in tests/language/nnbd. Moving it back into
language_2 with the other legacy tests.
Change-Id: Ica3c60deb43721ef73ec4527c6b83d39ee369282
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/128760
Commit-Queue: Paul Berry <paulberry@google.com>
Reviewed-by: Bob Nystrom <rnystrom@google.com>