version
is a very simple library who's job is to return the version of your crate if you're building with Cargo.
#[macro_use]
extern crate version;
// ...
version!() // Returns something like "1.0.0"
let ver : Version = FromStr::from_str( version!() ).unwrap();
This only works if you're building with Cargo since the macro fetches the version digits from enviroment variables set by Cargo ( CARGO_PKG_VERSION_{MAJOR, MINOR, PATCH}
).