clippy::host_endian_bytes: use of `to_ne_bytes`

What you see

warning: use of `to_ne_bytes`
 --> main.rs:3:15
  |
3 | let _x = 2i32.to_ne_bytes();
  |               ^^^^^^^^^^^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/stable/index.html#host_endian_bytes
  = note: requested on the command line with `-W clippy::host-endian-bytes`
help: convert to little endian
  |
3 - let _x = 2i32.to_ne_bytes();
3 + let _x = 2i32.to_le_bytes();
  |
help: convert to big endian
  |
3 - let _x = 2i32.to_ne_bytes();
3 + let _x = 2i32.to_be_bytes();
  |

Real output of Clippy 0.1.99 (Rust 1.99) on the example below. Names and line numbers in yours will differ.

Does it matter?

To ensure use of explicitly chosen endianness rather than the target’s endianness, such as when implementing network protocols or file formats rather than FFI.

Lints that forbid language features for specific codebases (no unwrap, no indexing...). Off by default; pick them one by one, never the whole group.

How to fix it

Clippy does not fix this one automatically (its suggestion may change behaviour, so it only shows it). Change the code by hand:

Flagged

let _x = 2i32.to_ne_bytes();
let _y = 2i64.to_ne_bytes();

Turn it off, or on

It is off by default. To use it, set it to warn or deny:

[lints.clippy]
host_endian_bytes = "warn"

#![warn(clippy::host_endian_bytes)]

cargo clippy -- -W clippy::host-endian-bytes

The [lints] table needs Rust 1.74 or newer. In a workspace, put it under [workspace.lints.clippy] and add [lints] workspace = true to each member.