How to disable unused code warnings in Rust?

September 21, 2022 by Tarik

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
```