RS.CLIPPY.MANUAL_NON_EXHAUSTIVE

Manual implementations of the non-exhaustive pattern can be simplified using #[non_exhaustive]

This checker is a Clippy lint created by The Rust Project Contributors. The documentation shown here is a copy of the original documentation for: manual_non_exhaustive. Copyright ©2025 The Rust Team. All rights reserved.

What it does

Checks for manual implementations of the non-exhaustive pattern.

Why is this bad?

Using the #[non_exhaustive] attribute expresses better the intent and allows possible optimizations when applied to enums.

Example

struct S {
    pub a: i32,
    pub b: i32,
    _c: (),
}

enum E {
    A,
    B,
    #[doc(hidden)]
    _C,
}

struct T(pub i32, pub i32, ());

Use instead:

#[non_exhaustive]
struct S {
    pub a: i32,
    pub b: i32,
}

#[non_exhaustive]
enum E {
    A,
    B,
}

#[non_exhaustive]
struct T(pub i32, pub i32);

Configuration

msrv: The minimum rust version that the project supports. Defaults to the rust-version field in Cargo.toml

(default: current version)