The Secrets of Rust: Tools by John Arundel

Author:John Arundel
Language: eng
Format: epub
Publisher: Bitfield Consulting
Published: 2025-02-21T00:00:00+00:00

One other field you might occasionally want to add is rust-version, which specifies the minimum Rust version that can be used to compile this crate. For example, we use the fs::exists function, which was added to the standard library in Rust 1.81, so this crate won’t work with Rust versions earlier than that. So we could set:

rust-version = "1.81"

This will give a helpful message to users who try to compile it with an incompatible version of Rust:

error: rustc 1.80.0 is not supported by the following packages: [email protected] requires rustc 1.81

If you don’t happen to know what your crate’s minimum supported Rust version (MSRV) is, though, don’t worry about it; this field is optional.

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