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Integer overflow or underflow

What it does

Checks for integer arithmetic operations which could overflow or panic. Specifically, checks for any operators (+, -, *, <<, etc) which are capable of overflowing according to the Rust Reference, or which can panic (/, %). No bounds analysis or sophisticated reasoning is attempted.

Why is this bad?

Integer overflow will trigger a panic in debug builds or will wrap in release mode. Division by zero will cause a panic in either mode. In some applications one wants explicitly checked, wrapping or saturating arithmetic.

Known problems


let a = 0;
let b = a + 1;

Use instead:

let a = 0;
let b = a.checked_add(1).ok_or(Error::OverflowDetected)?;


The detector's implementation can be found at this link.