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: mod.rs
    path of file: ./repos/deno/runtime/ops
    
    the code of the file until where you have to start completion: // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.

pub mod bootstrap;
pub mod fs_events;
pub mod http;
pub mod os;
pub mod
    
pub fn check_unstable(state: &OpState, feature: &str, api_name: &str) {
  // TODO(bartlomieju): replace with `state.feature_checker.check_or_exit`
  // once we phase out `check_or_exit_with_legacy_fallback`
  state
    .feature_checker
    .check_or_exit_with_legacy_fallback(feature, api_name);
}