Please stop using 0.11. It's a really old dialect or rust. Just work out of rust nightly, and use the docs on the http://rust-lang.org/ http://rust-lang.org/ to

Please stop using 0.11. It's a really old dialect or rust. Just work out of rust nightly, and use the docs on the http://rust-lang.org/ http://rust-lang.org/ to learn.