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#[no_mangle]
pub extern "C" fn main() {
    let input_size = unsafe { native::eth2_blockDataSize() as usize };
    let mut input = [0u8; 64000];
    unsafe {
        native::eth2_blockDataCopy(input.as_mut_ptr() as *const u32, 0, input_size as u32);
    }
    let mut pre_state_root = [0u8; 32];
    unsafe { native::eth2_loadPreStateRoot(pre_state_root.as_mut_ptr() as *const u32) }
    let post_root = entry(&mut input, &pre_state_root);
    unsafe { native::eth2_savePostStateRoot(post_root.as_ptr() as *const u32) }
}