single_elem_arr

What it does

Checks for arrays with single elements.

Advantage

• Reduces type complexity.

Drawbacks

No response

Example

fn main() {
    let mut a = [15u8];
    takes_slice(&a);
    takes_mut_slice(&mut a);
}
fn takes_slice(_: &[u8]) { todo!() }
fn takes_mut_slice(_: &mut [u8]) { todo!() }

Could be written as:

use std::slice::{from_ref, from_mut};
fn main() {
    let mut a = 15u8;
    takes_slice(from_ref(&a));
    takes_mut_slice(from_mut(&mut a));
}
fn takes_slice(_: &[u8]) { todo!() }
fn takes_mut_slice(_: &mut [u8]) { todo!() }

The issue does not name implementation files or tests. Start by reviewing the two Rust examples and determine the cases the proposed lint should recognize, including immutable and mutable slice conversions. Done means the lint identifies unnecessary single-element arrays and reports the suggested scalar-plus-slice construction.