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This is required because otherwise Object() == null requires the type signature of Object.operator==(Object o) to be changed to Object.operator==(Object? o). Which I don't think is the behavior we want. Confirmation that this CL is correct has been sent to the language team. I recommend we land, which will unblock my subtyping CL, and roll back/readdress later if need be. Change-Id: I498f9870e7128b2cac3012fff0cb1ab50fcc8df7 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/104344 Commit-Queue: Mike Fairhurst <mfairhurst@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Reviewed-by: Paul Berry <paulberry@google.com>
Run Existing Tests ================== See the output of ../tools/test.py --help for how to run tests. See also https://code.google.com/p/dart/wiki/Building#Testing for detailed examples. Create New Tests ================ See comments above factory StandardTestSuite.forDirectory in ../tools/testing/dart/test_suite.dart for the default test directory layout. By default test-file names must end in "_test.dart", but some test suites, such as ./co19, subclass StandardTestSuite and override this default. See comments at the beginning of ../tools/testing/dart/multitest.dart for how to create tests that pass by failing with a known error. For example, ... int x = "not an int"; /// 01: static type warning ... as part of a test will only pass the "--compiler dart2analyzer" test if the assignment generates a static type warning.