Function gio_2_0_sys::g_file_replace_contents_async

pub unsafe extern "C" fn g_file_replace_contents_async(
    file: *mut GFile, 
    contents: *mut u8, 
    length: gsize, 
    etag: *const gchar, 
    make_backup: gboolean, 
    flags: GFileCreateFlags, 
    cancellable: *mut GCancellable, 
    callback: Option<GAsyncReadyCallback>, 
    user_data: gpointer
)