You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: foundry.rs
    path of file: ./repos/bee/bee-block/src/output
    
    the code of the file until where you have to start completion: // Copyright 2021 IOTA Stiftung
// SPDX-License-Identifier: Apache-2.0

use alloc::vec::Vec;
use core::cmp::Ordering;

use packable::{
    error::{UnpackError, UnpackErrorExt},
    packer::Packer,
    unpacker::Unpacker,
    Packable,
};

use crate::{
    address::{Address, AliasAddress},
    output::{
        feature::{verify_allowed_features, Feature, FeatureFlags, Features},
        unlock_condition::{verify_allowed_unlock_conditions, UnlockCondition, UnlockConditionFlags, UnlockCondi
    
    fn destruction(current_state: &Self, context: &ValidationContext) -> Result<(), StateTransitionError> {
        let token_id = current_state.token_id();
        let input_tokens = context.input_native_tokens.get(&token_id).copied().unwrap_or_default();
        let TokenScheme::Simple(ref current_token_scheme) = current_state.token_scheme;

        // No native tokens should be referenced after the foundry destruction.
        if context.output_native_tokens.contains_key(&token_id) {
            return Err(StateTransitionError::InconsistentNativeTokensFoundryDestruction);
        }

        // This can't underflow as it is known that minted_tokens >= melted_tokens (syntactic rule).
        let minted_melted_diff = current_token_scheme.minted_tokens() - current_token_scheme.melted_tokens();

        if minted_melted_diff != input_tokens {
            return Err(StateTransitionError::InconsistentNativeTokensFoundryDestruction);
        }

        Ok(())
    }