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/tokio/tokio/src/runtime/task
    
    the code of the file until where you have to start completion: //! The task module.
//!
//! The task module contains the code that manages spawned tasks and provides a
//! safe
    
    fn drop(&mut self) {
        // Decrement the ref count
        if self.raw.header().state.ref_dec_twice() {
            // Deallocate if this is the final ref count
            self.raw.dealloc();
        }
    }