RS.CLIPPY.MEM_REPLACE_OPTION_WITH_SOME

Replacing an `Option` with `Some` instead of `replace()`

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

What it does

Checks for mem::replace() on an Option with Some(...).

Why is this bad?

Option already has the method replace() for taking its current value (Some(...) or None) and replacing it with Some(...).

Example

let mut an_option = Some(0);
let replaced = std::mem::replace(&mut an_option, Some(1));

Is better expressed with:

let mut an_option = Some(0);
let taken = an_option.replace(1);

Configuration

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

(default: current version)