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A transitive dependency is a dependency of a dependency. So if, for example, mesa3d_util does explicitly use zerocopy-derive, it should not need to a depend on it. The package that pulls in transitive should already include it has a dependency. This provides clearer methodologies in maintaining Rust code, similiar to how Cargo.toml handles it. Reviewed-by: David Gilhooley <djgilhooley.gmail.com>