When transpiling this C code

void I_Error (char *error, ...)
{
    va_list argptr;
    va_start (argptr,error);

the following code is emitted

#[no_mangle]
pub unsafe extern "C" fn I_Error(mut error: *mut std::ffi::c_char, mut args: ...) {
    let mut argptr: va_list = 0 as *mut std::ffi::c_char;
    argptr = args.clone();

The last line creates a compile error, because args is a Rust type, std::ffi::VaListImpl, and doesn't match the type of argptr.