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