error[E0045]: C-variadic function must have a compatible calling convention, like `C` or `cdecl` --> $DIR/E0045.rs:1:17 | LL | extern "Rust" { fn foo(x: u8, ...); } | ^^^^^^^^^^^^^^^^^^^ C-variadic function must have a compatible calling convention error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0045`.