RS.CLIPPY.PANICKING_OVERFLOW_CHECKS

Overflow checks which will panic in debug mode

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

What it does

Detects C-style underflow/overflow checks.

Why is this bad?

These checks will, by default, panic in debug builds rather than check whether the operation caused an overflow.

Example

if a + b < a {
    // handle overflow
}

Use instead:

if a.checked_add(b).is_none() {
    // handle overflow
}

Or:

if a.overflowing_add(b).1 {
    // handle overflow
}

Past names

overflow_check_conditional