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Rust Terminologies

extern crate​

In source code of some libraries, I see extern crate. I cannot use it in my code, how does it work?

https://doc.rust-lang.org/reference/items/extern-crates.html

An extern crate declaration specifies a dependency on an external crate.

Procedural Macros​

https://doc.rust-lang.org/reference/procedural-macros.html