func (st *State) LoadByteCode(key string) (*ByteCode, error) {
	return st.Loader.Load(key)
}
func (st *State) LoadByteCode(key string) (*ByteCode, error) {
	return st.Loader.Load(key)
}
// LoadByteCode loads a new ByteCode. This is used for op codes that
// call to external templates such as `include`