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Cargo workspaces have existed for a number of years now - the feature was released in Cargo alongside Rust 1.12 in September 2016: https://blog.rust-lang.org/2016/09/29/Rust-1.12.html

The version numbers are from a little more than a year ago. Originally, it was pretty much only compilation artifacts and some CLI. https://github.com/rust-lang/cargo/pull/10563