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Auto merge of #31159 - dirk:dirk/clarify-cargo-lock, r=steveklabnik

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Also remove a "finally" in the section about building for release to make it feel a bit friendlier.
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bors 2016-01-25 01:16:45 +00:00
commit 6866f1361d
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@ -511,15 +511,17 @@ programming languages. For complex projects composed of multiple crates, it’s
much easier to let Cargo coordinate the build. Using Cargo, you can run `cargo
build`, and it should work the right way.
## Building for Release
### Building for Release
When your project is finally ready for release, you can use `cargo build
When your project is ready for release, you can use `cargo build
--release` to compile your project with optimizations. These optimizations make
your Rust code run faster, but turning them on makes your program take longer
to compile. This is why there are two different profiles, one for development,
and one for building the final program you’ll give to a user.
Running this command also causes Cargo to create a new file called
### What Is That `Cargo.lock`?
Running `cargo build` also causes Cargo to create a new file called
*Cargo.lock*, which looks like this:
```toml