There should be build instructions to build hello.rs

[vi]

I'm rather new to Rust and try to look at zero.rs.

I get:

$ rustc hello.rs 
error: no item found for `freeze`
error: no item found for `closure_exchange_malloc`
error: no item found for `vector_exchange_malloc`
error: no item found for `sized`
error: no item found for `send`
error: no item found for `ty_visitor`
error: no item found for `opaque`
error: no item found for `ty_desc`
error: aborting due to 8 previous errors

$ rustc zero.rs 
error: duplicate entry for `copy`
error: duplicate entry for `drop`
error: duplicate entry for `add`
...
error: duplicate entry for `start`
error: aborting due to 35 previous errors

$ rustc zero.rs hello.rs 
error: multiple input filenames provided

$ rustc --version
rustc 0.8-pre (1c35ab3 2013-07-14 10:19:21 -0700)
host: i686-unknown-linux-gnu

How to build hello.rs?