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`Finalizable`s with extension methods work by virtue of being desugared into static methods and the `Finalizable`s being normal arguments. If we ever change the representation of extension methods, `Finalizable`s would need to be treated specially. This test will catch that. TEST=pkg/vm/test/transformations/ffi_test.dart Bug: https://github.com/dart-lang/sdk/issues/49643#issuecomment-1214847853 Change-Id: I68cfbc098386a88495d37417c6eb7295b89bfb95 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/255123 Reviewed-by: Tess Strickland <sstrickl@google.com> Commit-Queue: Daco Harkes <dacoharkes@google.com>