{"action":"created","comment":{"url":"https://api.github.com/repos/rust-lang/book/pulls/comments/94247879","pull_request_review_id":14779056,"id":94247879,"diff_hunk":"@@ -1,21 +1,358 @@\n # More about Cargo and Crates.io\n \n+We've used some features of Cargo in this book so far, but only the most basic\n+ones. We've used Cargo to build, run, and test our code, but it can do a lot\n+more. Let's go over some of its other features now. Cargo can do even more than\n+this; for a full explanation, see its documentation.\n+\n+We're going to cover:\n+\n+* Customizing your build through release profiles\n+* Organizing larger projects with 'workspaces'\n+* Extending Cargo with your own custom commands\n+* Publishing libraries on crates.io\n+\n+## Release profiles\n+\n+Cargo supports a notion of \"release profiles.\" These profiles control various\n+options for compiling your code, and let you configure each profile\n+independently of the others. You've seen a hint of this feature in the output\n+of your builds:\n+\n+```bash\n+$ cargo build\n+    Finished debug [unoptimized + debuginfo] target(s) in 0.0 secs\n+$ cargo build --release\n+    Finished release [optimized] target(s) in 0.0 secs\n+```\n+\n+The \"debug\" and \"release\" notifications here are profile names. 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What do you 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