Tracking issue for Replace `Vec::drain` by a method that accepts a range parameter (RFC 574)

[aturon]

rust-lang/rfcs#574

cc @mahkoh

[paulp]

The rfc says

Where Trait is some trait that is implemented for at least Range, RangeTo, RangeFrom, FullRange, and usize.

It also includes an example which depends on usize:

fn remove(x: &mut Vec<u8>, index: usize) -> u8 {
    x.drain_range(index).next().unwrap()
}

However RangeArgument only implements the first four. Furthermore as things stand it does not appear possible to accept RangeArgument and usize simultaneously, because dispatch doesn't consider the trait bound and reports that conflicting implementations exist.

[bluss]

@paulp Yes, #24781 was explicit about these issues. I forsee a new RFC to finish off drain and maybe the RangeArgument trait.