RS.CLIPPY.IF_THEN_SOME_ELSE_NONE

Finds if-else that could be written using either `bool::then` or `bool::then_some`

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

What it does

Checks for if-else that could be written using either bool::then or bool::then_some.

Why restrict this?

Looks a little redundant. Using bool::then is more concise and incurs no loss of clarity. For simple calculations and known values, use bool::then_some, which is eagerly evaluated in comparison to bool::then.

Example

let a = if v.is_empty() {
    println!("true!");
    Some(42)
} else {
    None
};

Could be written:

let a = v.is_empty().then(|| {
    println!("true!");
    42
});

Configuration

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

(default: current version)