<commit_before>% Hello, Cargo!

[Cargo](http://crates.io) is a tool that Rustaceans use to help manage their
Rust projects. Cargo is currently in an alpha state, just like Rust, and so it
is still a work in progress. However, it is already good enough to use for many
Rust projects, and so it is assumed that Rust projects will use Cargo from the
beginning.

Cargo manages three things: building your code, downloading the dependencies
your code needs, and building those dependencies. At first, your
program doesn't have any dependencies, so we'll only be using the first part of
its functionality. Eventually, we'll add more. Since we started off by using<commit_msg>Rollup merge of #24088 - GuillaumeGomez:patch-1, r=alexcrichton<commit_after>% Hello, Cargo!

[Cargo](http://crates.io) is a tool that Rustaceans use to help manage their
Rust projects. Cargo is currently in a pre-1.0 state, just like Rust, and so it
is still a work in progress. However, it is already good enough to use for many
Rust projects, and so it is assumed that Rust projects will use Cargo from the
beginning.

Cargo manages three things: building your code, downloading the dependencies
your code needs, and building those dependencies. At first, your
program doesn't have any dependencies, so we'll only be using the first part of
its functionality. Eventually, we'll add more. Since we started off by using
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