Function cppconnect6::cppbind::ffi_test::test_echo_raw_vec

#[no_mangle]
pub extern "C" fn test_echo_raw_vec(
    ptr: *const CInt, 
    len: CInt, 
    allocator: AllocatorType<CInt>
) -> RawVec<CInt>

Get int array from C++ and return repackaged one.