error[E0045]: C-variadic function must have C or cdecl calling convention
  --> $DIR/variadic-ffi-2.rs:3:11
   |
LL | fn baz(f: extern "stdcall" fn(usize, ...)) {
   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ C-variadics require C or cdecl calling convention

error: aborting due to previous error

For more information about this error, try `rustc --explain E0045`.