Installation Error

[dbl001]

I am running OS X 10.11.6.

$ rustc --version
rustc 1.46.0
$ cargo --version
cargo 1.45.1
...
error[E0554]: `#![feature]` may not be used on the stable release channel
    --> /Users/davidlaxer/.cargo/registry/src/github.com-1ecc6299db9ec823/lock_api-0.3.4/src/lib.rs:91:34
     |
  91 | #![cfg_attr(feature = "nightly", feature(const_fn))]
     |                                  ^^^^^^^^^^^^^^^^^
  

[dbl001]

Nevermind.

I ran:

$ ./rustup-init
$ source $HOME/.cargo/env
$ python setup.py install

... and in built successfully.