How to disable unused code warnings in Rust?

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You can either:

  • Add an allow attribute on a struct, module, function, etc.:

    #[allow(dead_code)]
struct SemanticDirection;

  • Add a crate-level allow attribute; notice the !:

    #![allow(dead_code)]

  • Pass it to rustc:

    rustc -A dead_code main.rs

  • Pass it using cargo via the RUSTFLAGS environment variable:

    RUSTFLAGS="$RUSTFLAGS -A dead_code" cargo build

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