Can't compile crate with rust 1.2

[tower120]

What rustc version (compiler flags?) do you need?
I'm trying with 1.2 stable, and have following errors:

C:\temp\rust-carboxyl-master\carboxyl-master>cargo build
    Updating registry `https://github.com/rust-lang/crates.io-index`
 Downloading rand v0.3.11
 Downloading quickcheck v0.2.23
 Downloading log v0.3.2
 Downloading winapi v0.2.2
 Downloading lazy_static v0.1.14
 Downloading libc v0.1.10
 Downloading winapi-build v0.1.1
 Downloading advapi32-sys v0.1.2
   Compiling lazy_static v0.1.14
   Compiling carboxyl v0.1.1 (file:///C:/temp/rust-carboxyl-master/carboxyl-mast
er)
src\lib.rs:136:1: 136:29 error: #[feature] may not be used on the stable release
 channel
src\lib.rs:136 #![feature(arc_weak, fnbox)]
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
error: aborting due to previous error
Could not compile `carboxyl`.

To learn more, run the command again with --verbose.

[milibopp]

carboxyl is not quite ready for stable Rust yet, because these features are used. However, it should be possible to fix this soon, once #47 is resolved.

For now, just use nightly Rust.

[tower120]

Maybe you need to add this to Readme.md ? For a while...

[milibopp]

Done. Thank you very much for the feedback!

I'm going to close this now, since #47 pretty much covers this. Feel free to re-open in case there are still any doubts.