1 No `main` function was found in a binary crate.
3 To fix this error, add a `main` function:
7 // Your program will start here.
8 println!("Hello world!");
12 If you don't know the basics of Rust, you can look at the
13 [Rust Book][rust-book] to get started.
15 [rust-book]: https://doc.rust-lang.org/book/