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: endpoint.rs
    path of file: ./repos/quinn/quinn-proto/src
    
    the code of the file until where you have to start completion: use std::{
    collections::{hash_map, HashMap},
    convert::TryFrom,
    fmt, iter,
    net:
    
    pub(crate) fn known_connections(&self) -> usize {
        let x = self.connections.len();
        debug_assert_eq!(x, self.index.connection_ids_initial.len());
        // Not all connections have known reset tokens
        debug_assert!(x >= self.index.connection_reset_tokens.0.len());
        // Not all connections have unique remotes, and 0-length CIDs might not be in use.
        debug_assert!(x >= self.index.connection_remotes.len());
        x
    }