Toolchain Horizons: Exploring Rust Dependency-Toolchain Compatibility

The author conducted an experiment to test the backward compatibility of the top 100 Rust crates on crates.io, revealing challenges in maintaining compatibility with older Rust versions due to dependencies. Motivated by issues encountered while developing a Rust client for TigerBeetle, a financial accounting database, the author aimed to reduce its minimum supported Rust version by removing dependencies and utilizing open-coded polyfills. The Rust ecosystem's concept of the Minimum Supported Rust Version (MSRV) and its impact on crate maintenance is highlighted, noting that dependencies like the futures crate are particularly difficult to eliminate due to their pervasive use. Despite efforts to lower the MSRV to Rust 1.63, the author found that dependency updates frequently broke compatibility, leading to the realization that Rust's compiler remains stable while its crate ecosystem does not. The experiment underscored the importance of maintaining a broad toolchain compatibility to accommodate enterprise and embedded system needs, although achieving this requires significant effort from crate authors to extend their toolchain horizons.

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