error[E0045]: C-variadic function must have a compatible calling convention, like `C`, `cdecl`, `win64`, `sysv64` or `efiapi` --> $DIR/variadic-ffi-2.rs:4:11 | LL | fn baz(f: extern "stdcall" fn(usize, ...)) { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ C-variadic function must have a compatible calling convention error: aborting due to previous error For more information about this error, try `rustc --explain E0045`.