error: incorrect function inside `extern` block --> $DIR/issue-75283.rs:2:8 | LL | extern "C" { | ---------- `extern` blocks define existing foreign functions and functions inside of them cannot have a body LL | fn lol() { | ________^^^___- | | | | | cannot have a body LL | | println!(""); LL | | } | |_____- help: remove the invalid body: `;` | = help: you might have meant to write a function accessible through FFI, which can be done by writing `extern fn` outside of the `extern` block = note: for more information, visit https://doc.rust-lang.org/std/keyword.extern.html error: aborting due to previous error