RS.CLIPPY.INFINITE_LOOP

Possibly unintended infinite loop

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

What it does

Checks for infinite loops in a function where the return type is not ! and lint accordingly.

Why restrict this?

Making the return type ! serves as documentation that the function does not return. If the function is not intended to loop infinitely, then this lint may detect a bug.

Example

fn run_forever() {
    loop {
        // do something
    }
}

If infinite loops are as intended:

fn run_forever() -> ! {
    loop {
        // do something
    }
}

Otherwise add a break or return condition:

fn run_forever() {
    loop {
        // do something
        if condition {
            break;
        }
    }
}