error[E0580]: `main` function has wrong type --> $DIR/extern-main-fn.rs:1:1 | LL | extern "C" fn main() {} | ^^^^^^^^^^^^^^^^^^^^ expected "Rust" fn, found "C" fn | = note: expected signature `fn()` found signature `extern "C" fn()` error: aborting due to previous error For more information about this error, try `rustc --explain E0580`.