New lint: `manual_slice_fill`

[sosthene-nitrokey]

What it does

Suggests using slice::fill instead of a manual loop

Advantage

• Makes code simpler
• Suggestion is better than that of needless_range_loop

Drawbacks

Uses a less known function (slice::fill)

Example

for i in 0..some_slice.len() {
    some_slice[i] = 0;
}

Could be written as:

some_slice.fill(0);

[sivchari]

@rustbot claim