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+The `main` function was incorrectly declared.
+
+Erroneous code example:
+
+```compile_fail,E0580
+fn main(x: i32) { // error: main function has wrong type
+    println!("{}", x);
+}
+```
+
+The `main` function prototype should never take arguments.
+Example:
+
+```
+fn main() {
+    // your code
+}
+```
+
+If you want to get command-line arguments, use `std::env::args`. To exit with a
+specified exit code, use `std::process::exit`.