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: config.rs
    path of file: ./repos/nearcore/core/parameters/src
    
    the code of the file until where you have to start completion: //! Settings of the parameters of the runtime.
use crate::config_store::INITIAL_TESTNET_CONFIG;
use crate::cost::RuntimeFeesConfig;
use crate::parameter_table::ParameterTable;
use near_account_id::AccountId;
use near_primitives_core::types::Balance;
use near_primitives_core::version::PROTOCOL_VERSION;

use super::parameter_table::InvalidConfigErro
    
    pub fn free() -> Self {
        let config_store = super::config_store::RuntimeConfigStore::new(None);
        let mut wasm_config =
            crate::vm::Config::clone(&config_store.get_config(PROTOCOL_VERSION).wasm_config);
        wasm_config.make_free();
        Self {
            fees: RuntimeFeesConfig::free(),
            wasm_config,
            account_creation_config: AccountCreationConfig::default(),
            storage_proof_size_soft_limit: usize::MAX,
        }
    }