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We do use the empty tuple type for function returns, so I don't want to get rid of it, but the value is unused. With this change, builtins are all types. Long-term the empty tuple value should have a representation similar to structs; just a tuple value that's empty, not a built-in.
Toolchain
A design is currently maintained in Google Drive. It'll be migrated to markdown once we are confident in its stability.