maidsafe_client 'Could not compile 'crust'

gistfile1.txt

jonny3000 (master) maidsafe_client $ cargo build
   Compiling crust v0.1.5
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:37:18: 37:36 error: use of unstable library feature 'alloc': Weak pointers may not belong in this module.
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:37 type WeakState = Weak<Mutex<State>>;
                                                                                                                           ^~~~~~~~~~~~~~~~~~
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:97:29: 97:40 error: use of unstable library feature 'alloc': Weak pointers may not belong in this module.
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:97         let ws = self.state.downgrade();
                                                                                                                                      ^~~~~~~~~~~
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:196:29: 196:40 error: use of unstable library feature 'alloc': Weak pointers may not belong in this module.
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:196         let ws = self.state.downgrade();
                                                                                                                                       ^~~~~~~~~~~
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:278:37: 278:48 error: use of unstable library feature 'alloc': Weak pointers may not belong in this module.
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:278         let weak_state = self.state.downgrade();
                                                                                                                                               ^~~~~~~~~~~
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:305:29: 305:40 error: use of unstable library feature 'alloc': Weak pointers may not belong in this module.
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:305         let ws = self.state.downgrade();
                                                                                                                                       ^~~~~~~~~~~
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:337:29: 337:40 error: use of unstable library feature 'alloc': Weak pointers may not belong in this module.
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:337         let ws = self.state.downgrade();
                                                                                                                                       ^~~~~~~~~~~
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:353:33: 353:44 error: use of unstable library feature 'alloc': Weak pointers may not belong in this module.
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:353         let mut ws = self.state.downgrade();
                                                                                                                                           ^~~~~~~~~~~
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:407:66: 407:77 error: use of unstable library feature 'alloc': Weak pointers may not belong in this module.
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:407                         let _ = try!(handle_connect(state_cloned.downgrade(), trans,
                                                                                                                                                                            ^~~~~~~~~~~
<std macros>:1:1: 6:48 note: in expansion of try!
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:407:33: 408:84 note: expansion site
note: in expansion of closure expansion
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:403:50: 413:14 note: expansion site
note: in expansion of for loop expansion
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:400:9: 414:10 note: expansion site
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:427:41: 427:52 error: use of unstable library feature 'alloc': Weak pointers may not belong in this module.
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:427         let mut weak_state = self.state.downgrade();
                                                                                                                                                   ^~~~~~~~~~~
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:467:11: 467:20 error: use of unstable library feature 'alloc': Weak pointers may not belong in this module.
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:467     state.upgrade().ok_or(io::Error::new(io::ErrorKind::Interrupted,
                                                                                                                     ^~~~~~~~~
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:479:11: 479:20 error: use of unstable library feature 'alloc': Weak pointers may not belong in this module.
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/connection_manager.rs:479     state.upgrade().ok_or(io::Error::new(io::ErrorKind::Interrupted,
                                                                                                                     ^~~~~~~~~
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/lib.rs:33:30: 33:38 error: unused or unknown feature
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/lib.rs:33 #![feature(ip_addr, ip, udp, arc_weak)]
                                                                                                                        ^~~~~~~~
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/lib.rs:27:29: 27:44 note: lint level defined here
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/lib.rs:27         unused_comparisons, unused_features, unused_parens, while_true)]
                                                                                                                       ^~~~~~~~~~~~~~~
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/lib.rs:33:1: 33:40 error: unstable feature
/Users/jonny3000/.cargo/registry/src/github.com-1ecc6299db9ec823/crust-0.1.5/src/lib.rs:33 #![feature(ip_addr, ip, udp, arc_weak)]
                                                                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
note: this feature may not be used in the stable release channel
error: aborting due to 13 previous errors
Could not compile `crust`.

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

first question as always in a case like this....

• Do you have the latest crust nightly build?

run
rustc --version

you should get back something like
rustc 1.3.0-nightly (7ea2674c7 2015-07-13)

If not run
curl -sSf https://static.rust-lang.org/rustup.sh | sh -s -- --channel=nightly

and try again.