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edition

A set of language rules a project opts into, like 2024.

An edition (2015, 2018, 2021, 2024) selects syntax and lint defaults per crate; crates of different editions interoperate.

Examples

  • if let Some(n) = lives && n > 0 compiles under edition = "2024"; under 2021 it fails with "let chains are only allowed in Rust 2024 or later".

See also

rust-version Cargo.toml release channel edition migration
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