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Description
I backported docs to System.IO as an experiment. It made FileSystemName (which is in corelib) have <see cref="System.IO.FileSystemWatcher" /> (which is in a different assembly). This is fine for the docs build because its context is apparently "everything". However the compiler complains with CS1574 and I have to remove the cref.
When making code the source of truth, how can we preserve cref's across assemblies?