needless_range_loop does not trigger if array being indexed is in a struct

[mnemonikr]

Summary

needless_range_loop does not fire if accessing an array in a loop if the array is held in an object.

Lint Name

needless_range_loop

Reproducer

I tried this code:

struct Data<const N: usize>([u64; N]);

fn example<const N: usize>(data: Data<N>) -> u64 {
    let mut sum = 0;

    for i in 0..N {
        // Does not trigger the lint
        sum += data.0[i];

        // Uncomment below to trigger lint
        // let array = &data.0;
        // sum += array[i];
    }

    sum
}

I expected to see this happen:

needless_range_loop lint to trigger when accessing data.0[i] in the loop. It fires when accessing the array directly through a reference (see commented out section).

Instead, this happened:

The lint did not fire

Version

rustc 1.89.0 (29483883e 2025-08-04)
binary: rustc
commit-hash: 29483883eed69d5fb4db01964cdf2af4d86e9cb2
commit-date: 2025-08-04
host: x86_64-unknown-linux-gnu
release: 1.89.0
LLVM version: 20.1.7

[zihan0822]

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