`integer_division` false negative for `NonZero` denominators

[SLUCHABLUB]

Summary

The integer_division lint, as I've understood it, is meant to restrict the use of integer division. When dividing an integer by a NonZero version of it, whilst safe from division-by-zero errors, the remainder is still discarded. I believe that this lint should be emitted in such cases, but currently, it is not.

Lint Name

integer_division

Reproducer

I tried this code:

#![warn(clippy::integer_division)]

use std::num::NonZeroU32;

const TWO: NonZeroU32 = NonZeroU32::new(2).unwrap();

fn main() {
    let x: u32 = 3;

    // emits the lint
    println!("{}", x / 2);
    // does not emit the lint
    println!("{}", x / TWO);
    
    // both print "1"
}

I expected to see this happen:

I expected x / TWO to produce a warning.

Instead, this happened:

No warning was emitted.

Version

rustc 1.86.0 (05f9846f8 2025-03-31)
binary: rustc
commit-hash: 05f9846f893b09a1be1fc8560e33fc3c815cfecb
commit-date: 2025-03-31
host: aarch64-apple-darwin
release: 1.86.0
LLVM version: 19.1.7

[alex-semenyuk]

@rustbot claim