This crate provides libcore, liballoc, libcollections, and librustc_unicode from the Rust source tree as Cargo packages. libcore has no dependencies; the rest depend on this version of libcore.

Before compiling, each package runs rustc --version to determine the version of rustc that your project is using. It then downloads the corresponding source code. This means that the appropriate version of each library is used.

Simply add the dependencies you need to your Cargo.toml:

[dependencies]
rust-libcore = { git = "https://github.com/SergioBenitez/rust-libcore" }
rust-liballoc = { git = "https://github.com/SergioBenitez/rust-libcore" }
rust-libcollections = { git = "https://github.com/SergioBenitez/rust-libcore" }
rust-librustc_unicode = { git = "https://github.com/SergioBenitez/rust-libcore" }

Ensure that all of your libraries are using rust-libcore as the core library. Otherwise, you may find yourself with a slew of duplicate lang_item definitions. Note: it's unlikely that you need to depend on rust-librustc_unicode directly. If you're using rust-libcollections, the crate will pull in librustc_unicode automatically.