error[E0045]: C-variadic function must have a compatible calling convention, like `C`, `cdecl`, `system`, `aapcs`, `win64`, `sysv64` or `efiapi`
  --> $DIR/variadic-ffi-2.rs:5:11
   |
LL | fn baz(f: extern "stdcall" fn(usize, ...)) {
   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 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`.