What it does

If someone didn't know that various functions can take an impl IntoIterator instead of an impl Iterator for their arguments, they might have wrote useless explicit .into_iter()s.

See also #1094

Lint Name

explicit_into_iter_fn_arg

Category

pedantic

Advantage

No response

Drawbacks

No response

Example

fn main() {
    let mut v = vec![];
    v.extend(vec![0].into_iter());
}

Could be written as:

fn main() {
    let mut v = vec![];
    v.extend(vec![0]);
}