feature request: add convenient [] operator to std::vec::Vec

[alsam]

Dear Developers,

Rust language occurred to be amazingly suitable for many programming tasks.
For example, I successfully completed in Rust Coursera Illinois VLSI CAD: Logic to Layout one of the programming assignments and going to use Rust for the others.
Unfortunately after recent changes to the language the Rust code for the completed assignment occurred to be broken. No problem with it as the language evolves.

But the following constructs proposed for the new vec_ng::Vec design (below) v.get(1) and especially *v.get_mut(1) instead of used to be [] are bulky and over-complicated in my opinion:

use std::io::println;
use std::vec::Vec;

fn main()
{
    let mut v = vec!(1, 2, 3);
    //let elem = v[1];
    let elem = v.get(1);
    //v[1] = 4;
    *v.get_mut(1) = 4;
}

Could you please add more usual [] index access to std::vec_ng::Vec design?
Thanks!

[huonw]

I agree that [] syntax is nice, unfortunately our current index overloading technique needs an overhaul: #6515

When #6515 gets fixed, Vec will be the first thing to use the new traits.

[alsam]

Ok, thanks for clarification.

[thestinger]

I don't think we need this as another issue. I've already mentioned this in #11875.

[alsam]

Dear Developers,
Just noticed that convenient [] works from the box for read accesses for 0.11, e.g.
let elem = v[1]; instead of deprecated let elem = v.get(1);
However wasn't able to figure out how to write:
any attempt to write to the vector, e.g. v[1] = 4; leads to error:
error: cannot assign to immutable dereference (dereference is implicit, due to indexing)
in documentation for http://doc.rust-lang.org/std/vec/struct.Vec.html
it is noted that get_mut is deprecated.
Could you please give a working example for write mutable access to vector elements?
Thanks!

[huonw]

@alsam #12825 means that mutable indexing doesn't work as we'd like it yet, so we haven't changed the old form yet, that is, *v.get_mut(1) = 4; is still the correct way to write to a vector (I believe only get is deprecated, get_mut is still experimental).

[alsam]

@huonw Thanks a lot for clarification!